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[IP] more on Breathalyzers and Open Source





Begin forwarded message:

From: Jim Thompson <jim@xxxxxxxxxxx>
Date: October 25, 2005 5:48:51 PM EDT
To: dave@xxxxxxxxxx
Cc: br2@xxxxxxxxxxxxxxxx, andrew@xxxxxxxxx
Subject: Re: [IP] more on Breathalyzers and Open Source


which test to take is largely one time 'time since your median drink'. Alcohol levels will tend to show up in blood test (including breathalyzers) first, then in urine tests.

the police know this, and *will* let you soak in the drunk tank for a while in order to get the number in your urine test 'up'.

they will also tend to videotape your behavior both at the scene (in- squad) and in jail, for use in court.

In any case, there are at least 5 requirements on law enforcement officers in most (perhaps all) US states:

The officer must have had a reasonable suspicion that you were violating the law. The officer must have either had probable cause to arrest you or needs your consent for roadside tests. The officer must tell you that you have a right to refuse a portable breathalyzer test. The officer must have probable cause before he arrests you and before he requires you to take a chemical test. The officer must give you your Miranda rights after you are arrested, if he is going to interrogate you.

Most states prohibit the use of portable breath testing results as evidence at trial in a DUI case, in these states, once you are arrested and taken to the courthouse/jail, you will be administered a second, more reliable test for evidence, and the 'portable test' will be used to establish 'probable cause'. Most states also require that a driver be observed continuously for a minimum period, such as twenty minutes, prior to a breath test in order for the results to be considered admissible and valid.

IANAL, and please don't drink and drive.

jim

On Oct 25, 2005, at 11:14 AM, David Farber wrote:




Begin forwarded message:

From: Bradley Roberts <br2@xxxxxxxxxxxxxxxx>
Date: October 25, 2005 4:04:40 PM EDT
To: David Farber <dave@xxxxxxxxxx>
Cc: "Andrew D. Swart" <andrew@xxxxxxxxx>
Subject: Re: [IP] more on Breathalyzers and Open Source


A friend got pulled over in front of me for some minor infraction (into a bike lane too early for a right turn, if I remember correctly). I knew he had come from a bar and had probably had at least one drink. They started in on the normal dui tests (speech, eye, coordination, etc) in front of me. I had enough time before this to tell him not to submit to a breathalyzer as they're inaccurate - he said that he was probably above the limit, so I told him that he could expect that they'd figure this out and he'd be taken to the police station for a blood test if he refused a breathalyzer.

By refusing to submit to the breathalyzer, under CA law (or at least in San Luis Obispo), the officers have the option to place the person under arrest and take them in for more thorough evaluation. They did this - unfortunately for my friend, he didn't take well to being handcuffed and started to argue/resist. Probably would have been treated better had he not. Ultimately his blood was tested and was found above the legal limit. He made a bad choice and is still paying the consequences but no one was hurt.

However, it should be clear that if you refuse to take a breathalyzer test, you MAY be arrested. Whether or not you've ever had a drop of alcohol in your life. Refusing the test is within your rights, but an officers suspicion will quickly place you in shackles and you'll be subjected to the more reliable (and repeatable) tests.




Begin forwarded message:

From: "Andrew D. Swart" <andrew@xxxxxxxxx>
Date: October 24, 2005 4:30:21 PM EDT
To: dave@xxxxxxxxxx, 'Ip Ip' <ip@xxxxxxxxxxxxxx>
Subject: RE: [IP] more on Breathalyzers and Open Source
Reply-To: andrew@xxxxxxxxx




...I mention all these factors because they are common in many
measurement instruments...
...No amount of viewing the code will tell you that.





A local attorney (Santa Barbara) regularly takes out full page ads in
local papers seeking DUI clients, but also advising people of their
rights during a suspected DUI stop.  One of his biggest pieces of
advice:  refuse under all circumstances an invitation to take a
breathalyzer test. He points out that the portable technology is flawed and the results can't be verified independently (only a single sample).
Instead, do no resist, if law enforcement insists, taking a blood or
urine test. More reliable and samples remain for independent testing at later stage. Warning: refusing a breathalyzer test (but not the other
tests) in California is reportedly within our rights; this may not be
the case in all other states.

Andrew Swart



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--
Bradley Roberts (br2@xxxxxxxxxxxxxxxx)
Graduate Student, Department of Materials Science & Engineering
Roberts Hall 302 Box 352120
University of Washington
Seattle, WA 98195
206-616-7485 lab
206-543-3100 fax


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