They likely did two tests to see if the alcohol in your mouth dissipated sufficiently to indicate something harmless, like mouthwash. Have they already told you that they are going to violate you? If so, I would kindly but strongly recommend you ASAP consult with a local attorney like myself to assess all your options and potential defenses. If you are "show caused" for allegedly violating your Probation, you could be jailed, so please be careful! Warmest regards, Matt Catchick. 248-606-5522.
You said you are accused of failing a breathalyzer, however the only real issue is whether they have filed for a formal probation violation. If they haven't filed a formal probation violation, than it would appear there is no ongoing issue between you and probation.
Now, if there is a formal probation violation matter to be dealt with, than you may need to touch base with an attorney in the near future. If the alleged alcohol use was in the past 72-80 hours than you should contact a lab that does ETG testing and request a test immediately. If the incident occurred more than 80 hours ago, than you will not be able to scientifically prove that you were not drinking outside of the PBT device results themselves.
Best of Luck.
An Attorney-Client relationship has not been established. Becket J. Jones is not your attorney.
Breath tests can absolutely be inaccurate in both the function of the machine and through operator error. That being said, I agree with my colleagues above. If your parole is violated hire a local attorney ASAP.
The pbt is not that reliable especially if the police don't follow the required protocol. Not that surprising the second result was different. It is for this reason the accused need an attorney who understands the science and flaws inherent in this device.
Also, you should consult a licensed attorney in Michigan about your particular case, as this is not meant to be legal advise to you, but rather information on how our legal system operates, generally.