http://money.msn.com/saving-money-ti...5-4300198ce30c
A do-it-yourself DUI test?
France will soon begin requiring all drivers to carry a kit that can measure blood-alcohol content. You can get the single-use tests here for as little as $2 a pop.
By MSN Money partner Feb 27, 2012 9:36AM
Starting July 1, you'll have to carry a portable blood-alcohol test kit with you if you want to drive in France. You'll be fined 11 euros -- about $15 -- if you can't produce one when the gendarmes ask.
Who knew such a thing even existed?
Turns out they're about the size of a cigarette, available in the U.S. and much cheaper when purchased in bulk. Expect to pay as much as $7 at a retail counter but as little as $2 when you buy a bunch. We found them at Wal-Mart and suggest you read the instructions before your first drink, just to be safe.
The chemically coated crystals inside these single-use devices react to concentrations of alcohol in the user's breath, turning colors above a certain threshold. Most manufacturers sell the devices tuned for "zero tolerance" situations (such as school, they note), 0.05% (the legal blood-alcohol level in France), or 0.08%, the limit in the U.S.
Friends in Europe suggest carrying two: One to use and one to show the police.
Back in the good ol' U.S. of A, while the devices are strictly optional, the $2 gizmo strikes us as cheap insurance if you've had one more than you had planned. They won't tell you anything you didn't already know, but maybe you'll pay attention to the result based on sheer novelty value.