I've been wanting one of those. You can now get ones that are approved for highway patrol usage (accuracy tests and so on) for under $150. I'd definitely bring it in to parties and so on, but I really want it so I can keep it in the glove box in my car and no when I'm okay to drive home after going to a bar or club. I suspect that sometimes when I feel like I'm sober blood/alcohol level remains in DUI territory. And, living in Utah, you can bet that there are cops gathered around all the bars at closing time (no alcohol can be served in Utah after 1:00 a.m.).