Be careful with breathalisers!!! They can make you do stupid things. I got a portable one, and decided to take it to the battle crusier. It was a great laugh at first, passing it around to test who was getting drunk the fastest. But, then I had the stupid idea to get to .25. Being able to know exactly how intoxicated I was, I would drink more and more quicker to see how quickly I could get to .25. When I was there, I had another few shots to stay there! As anyone who is a drinker will know, after you get to a reading, your going to go past it. Alcohol gradually releases into your blood stream, so I ended up blowing closer to .30!!! .35 is enough to kill you. The next day, at 3pm, I blew a 0.07. Still unable to drive! Stay away from thoes things!