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I appreciate bar manager Howard Jones' opinion about having an accurate Breathalyzer available to bar patrons ("BreathAdvisor lies," Forum, March 30).

Just as a speedometer won't prevent every driver from speeding, my product will not prevent every patron from drinking and driving. BreathAdvisor offers patrons an accurate reading of their blood alcohol content level, but what they do with that information is up to them.

If you've had any amount of alcohol, we advise against driving. If you follow that philosophy, you can save yourself $2 and not bother to use the machine. As a bar manager, Jones knows that the majority don't follow this philosophy.

Everyone processes alcohol differently, so there is no rule of thumb to follow for how much you can consume. The perception of how drunk you feel depends on many factors (energy drinks, food consumption, consumption rate, etc.).

I agree that people who have been drinking will often think that they are OK to drive. Wouldn't it be nice to have a tool that could help convince them otherwise?

Jason Knott BreathAdvisor founder and CEO

Murray