I remember a while back seeing something about cocktail straws that change color if your drink has been drugged. That would be an inconspicuous but more sanitary method probably. Especially if a bar just had those instead of regular cocktail straws. Then again, most of the people I know who have been drugged were at house parties. I think the idea is that if the test is in your nail polish you don't have to bring anything along with you. That said, dipping your finger in your drink seems gross to me, if I'm out drinking my hands probably aren't at their cleanest. I wouldn't put my finger in my mouth out in the world, so I wouldn't put it in my drink. The best way to prevent getting drugged is to never take drinks from someone, keep careful watch on your drink and keep it with you at all times, or just drink at home or with only small groups of people you know (still, good practice to watch your drink. You never know, some people aren't as friendly as they seem.)