the alcotest® 7110: what you need to know for trialthe alcotest® 7110: what you need to know for...
TRANSCRIPT
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The Alcotest® 7110: What You Need to Know for Trial
Presenters: Samuel Louis Sachs, Esq. Lauren E. Scardella, Esq.
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Basic Operation of the Alcotest®
• Procedural Requirements • Periodic Calibration of Alcotest
• 20 Minute Lockout and Arrest Time
• 20 Minute Observation Period
• E.M.I. (RF) Interference
• Operator Instructions
• Changing Mouth Pieces
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Breath Testing
• Sample Criteria • 1.5 Liters • 4.5 seconds
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Methods of Analysis• Infrared Detector (IR) • Electrochemical Cell (EC)
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Methods of Analysis (cont.)
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Computerization of Breath Testing
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Computerization of Breath Testing
• Microprocessor • A/D Conversion • Sensors • Pumps • Software
– Object Code – Source Code – Firmware (EEPROM) – Memory (RAM) – Digital Data Logging
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Computer Implementation of a Goal Overly Simplified for Lawyers
Our Goal Goal: Determine volume of a cube and print the result on a label Algorithm: a formula or a recipe Length x Width x Height
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Source Code
A Computer language readable by a human being. A list of steps to be taken to implement the Algorithm. Source Code is a computer language such as “Basic” “C” “Fortran” or “Cobol.”
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Source Code (cont.)
Source Code to implement our Algorithm in our “pretend” computer language.
1. Measure the length and put it in box A 2. Measure the width and put it in box B 3. Measure the height and put it in box C 4. Multiply the number in A times the number in B times
the number in C 5. Record the product of the multiplication in box D 6. Print the number in box D followed by words “cubic
inches.”
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Source Code (cont.)
Source Code lines 1 through 6 would be looked at (read) by a computer program called a Compiler, used by a computer programmer (Nerd and/or Geek variety).
A Compiler program “translates” our Source Code into Object Code to be read by a computer. This Object Code is “burned” into computer chips called “EEPROMs.”
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Object Code
A numerical language which is only computer readable and might look like
this:
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Object Code (cont.)
01010 11001 11001 00010 00000 10101 11101 11010 11100 00011 11111 00010 11110 11101 11101 11000 11110 11101 11010 11010 01010 11001 11001 00010 00000 10101 11101 11010 11100 00011 11111 00010 11110 11101 11101 11000 11110 11101 11010 11010 01010 11001 11001 00010 00000 10101 11101 11010 11100 00011 01010 11001 11001 00010 00000 10101 11101 11010 11100 00011 11111 00010 11110 11101 11101 11000 11110 11101 11010 11010 01010 11001 11001 00010 00000 10101 11101 11010 11100 00011 11111 00010 11110 11101 11101 11000 11110 11101 11010 11010 01010 11001 11001 00010 00000 10101 11101 11010 11100 00011
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Object Code (cont.)
When another computer, set up to accomplish the Goal, reads the Object Code put into its EEPROMs, it performs all the steps necessary to accomplish the Goal though implementation of the Algorithm.
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N.B.
1. The Algorithm must be scientifically proven to properly accomplish the Goal or the results are faulty.
2. Each programmer would likely write different Source Code steps to implement the same Algorithm.
3. Mistakes in the Source Code can cause system crashes and inaccurate results.
4. Hardware problems can cause errors in reading the EEPROMs and cause wrong or no results.
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Tolerance vs. Accuracy
Tolerance is how close the readings are to each other.
Accuracy is how close they are to the actual value.
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The Alcohol Influence Report
1
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The Paper Chase – The Golden Twelve
1. New Standard Solution Report of the most recent control test solution change, and the credentials of the operator who performed that change;
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New Standard Solution Report
6
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Credentials of Operator Who Performed Solution Change
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The Paper Chase – The Golden Twelve
2. Certificate of Analysis for the .10 percent solution used in that New Standard Solution Report.
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Certificate of Analysis for .10% Solution
22
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The Paper Chase – The Golden Twelve
3. Dräger Certificate of Accuracy for the Alcotest® CU-34 Simulator
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Certificate of Accuracy for CU-34
9
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The Paper Chase – The Golden Twelve
4. Dräger Certificate of Accuracy for the Alcotest® 7110 Temperature Probe
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Certificate of Accuracy for Temperature Probe
10
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The Paper Chase – The Golden Twelve
5. Dräger Certificate of Accuracy for the Alcotest® 7110 Instrument
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Certificate of Accuracy for Alcotest®
8
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The Paper Chase – The Golden Twelve
6. Calibration Records, including control tests, linearity tests, and the credentials of the coordinator who performed the calibration.
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Calibration Record
2
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Part I – Control Tests
3
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Part II – Linearity Tests
4
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Credentials of Coordinator Who Performed Calibration
25
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Credentials of Coordinator Who Performed Calibration
25
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The Paper Chase – The Golden Twelve
7. Certificate of Analysis for the .10 percent solution used in the calibration control test
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Certificate of Analysis for .10% Solution used in Calibration Control Test
17
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The Paper Chase – The Golden Twelve
8. Certificates of Analysis for the .04%, .08% and .16% solutions used in the linearity tests
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Certificate of Analysis for .04% Solution
18
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Certificate of Analysis for .08% Solution
19
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Certificate of Analysis for .16% Solution
20
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The Paper Chase – The Golden Twelve
9. New Standard Solution Report following most recent Calibration.
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New Standard Solution Report following most recent calibration
5
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The Paper Chase – The Golden Twelve
10.Dräger Safety Certificates of Accuracy for simulators (CU-34s) used in calibration.
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CU-34 Certificates of Accuracy
13
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CU-34 Certificates of Accuracy
14
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CU-34 Certificates of Accuracy
15
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The Paper Chase – The Golden Twelve
11.Dräger Safety Certificate of Accuracy for Black Key Temperature Probe used in calibration of Alcotest®.
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Certificate of Accuracy for Black Key Temperature Probe
16
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The Paper Chase – The Golden Twelve
12.Dräger Safety Ertco-Hart Calibration Report (now Control Company Thermometer Calibration Report).
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Control Company Thermometer Calibration Report
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What must be offered in Evidence?
The following documents must be offered in evidence by the State to demonstrate the Alcotest® was in proper working order:
1. The most recent Calibration Report prior to a defendant's test, including control tests, linearity tests, and the credentials of the coordinator who performed the calibration;
2. The most recent New Standard Solution Report prior to a defendant's test; and
3. The Certificate of Analysis of the 0.10 Simulator Solution used in a defendant's control tests.
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Worksheet A
State must submit a tolerance calculation demonstrating that the four readings are within +/- 5% of the mean of the four readings.
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Worksheet AChris Hewitt Esq.'s
Tolerance CalculatorCourtesy of Law Offices of Samuel Sachs
Defendant: Jane Doe
TOLERANCE CALCULATIONSinsert four readings in boxes 7 through 10 in column B
EC(1) 0.1280IR(1) 0.1270EC(2) 0.1330IR(2) 0.1320
Mean (also known as the average) 0.13 (adding all four readings, then dividing by 4)
Highest reading 0.1330Lowest reading 0.1270
Absolute Tolerance upper limit 0.135 (adding .005 to the mean)Absolute Tolerance lower limit 0.125 (subtracting .005 from the mean)
Relative Tolerance upper limit 0.1365 (multiplying mean by 1.05)Relative Tolerance lower limit 0.1235 (multiplying mean by 0.95)
UPPER TOLERANCE LIMIT 0.1365 (using Absolute Tolerance when the mean is less than .1000;LOWER TOLERANCE LIMIT 0.1235 using Relative Tolerance when the mean is greater than .1000)
Highest reading within tolerance? YES (comparing Upper Tolerance Limit with highest reading)Lowest reading within tolerance? YES (comparing Lower Tolerance Limit with lowest reading)
This software may be distributed, without limitation, as long as attribution is given to Mr. Hewitt.
©2008 Law Offices of Samuel Sachs East Windsor, NJ 08520
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Margin of Error (Accuracy)
The Alcotest® is subject to a margin of error of at least +/- 5% or, practically speaking, +/- 8.33%.
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Alcotest Discovery Checklist