San Antonio DWI Defence Attorney

Law Office of Robert H. Featherston, P.C.


(210)279-3711


San Antonio, Texas

Before You Discuss Anything


With Law Enforcement,


Call Me Now.


I Can Help You Preserve 


Your Legal Rights!


(210) 279-3711

SERIOUS ALLEGATIONS DEMAND COMPETENT AND EFFECTIVE REPRESENTATION. 


I PROVIDE IT!


courtroom technology

INTOXICATION ISSUES THAT I ADDRESS:

San Antonio DWI

TEXASDWI.NET

San Antonio DWI Defense Attorney


As a skilled attorney I can construct a strong defense for you!

For my clients, a Driving While Intoxicated, DWI,  allegation is a Serious Matter. I treat each case with the upmost respect.

(210) 279-3711

Don’t let these breath test machines 


intimidate you! 


They doesn’t even have a manufacturer’s warranty!


skilled attorney can demonstrate to a jury why these machines should not be trusted.

intoxilyzer 5000 breath test
dwi breath test
dwi testing

Before You Discuss Anything


With Law Enforcement,


Call Me Now.


I Can Help You Preserve 


Your Legal Rights!


(210) 279-3711

SERIOUS ALLEGATIONS DEMAND COMPETENT AND EFFECTIVE REPRESENTATION. 


I PROVIDE IT!


Before You Discuss Anything


With Law Enforcement,


Call Me Now.


I Can Help You Preserve 


Your Legal Rights!


(210) 279-3711

SERIOUS ALLEGATIONS DEMAND COMPETENT AND EFFECTIVE REPRESENTATION. 


I PROVIDE IT!


This machine uses a Mason jar to hold a solution of water and alcohol that is meant to act as a reference for the machine to check itself.  Its not uncommon that solution is improperly mixed resulting in a inaccurate result.  Additionally, the temperature of the solution is critical, thats why their is a thermometer hanging in the jar.  Most times the operator of the machine fails to read the temperature in the solution prior to the test being performed! This type of error can prevent the State from using the results in Court!

Pressure Switch or Pressure Sensor


This machine will not function unless it can implement the principles of Henry’s Gas Law.  A known temperature and pressure are critical to its operation.  The manufacturer designed this machine for use with a pressure sensor that would dynamically measure the pressure in the test chamber during the testing cycle.  Instead of purchasing the machine as designed, the State of Texas wanted a cheaper model and demanded that a pressure switch be used instead.  The pressure switch starts the testing cycle when a certain pressure is reached, but the computer cannot then measure and take into account any changes in pressure during the testing cycle.  How many people do you know that can blow at a constant pressure??  Henry’s Law, the machine’s design principle and it’s Achilles’ Heel !


Don’t let these breath test machines 


intimidate you!


A skilled attorney has a good probability of defeating them in Court.


Contact me now to learn more!


(210) 279-3711

Intoxilyzer 9000

Intoxilyzer 9000 breath test

Intoxilyzer 9000 is the latest purchase for the State of Texas.  It uses the same infared technology as the below listed Intox 5000, with the same technological issues.  The manufacturer, CMI, as with the 5000 has not/will not release the software code for peer reviewed examination.  The infared photo spectrometry that the machines use to detect alcohol in the human body is not specific for the alcohol that we drink, producing false positive results.

BLOOD TESTING


Did you volunteer, or were you forced to take a blood

test for alcohol content?  The State of Texas is going to claim that analyzing your blood with a state of the art gas chromatograph is the gold standard for determining blood alcohol content.

  

A competent defense attorney will tell you that analyzing your blood with a gas chromatograph is the Gold Standard for Cross Examination! From technician training to lab documentation to sample preparation and proper operation of the gas chromatograph with its flame ionization detector.  Their are numerous, valid issues to doubt the results that a techician obtains from this device.

DWI blood testing
dwi blood testing, gc/ms