Deciding to take a drug is one thing. Having someone slip something in your drink -- or "dose" you -- is quite another. There's no need to be paranoid, but if you don't like surprises, here are some ways to avoid trouble: 

• Politely refuse drinks (alcoholic and otherwise) from strangers, and avoid leaving your drink unattended.
• Even if you're buying bottled water at a rave, make sure the seal on the cap is not broken.
• The same goes for food. Take pre-packaged snacks with you.
• Go with a buddy -- an extra set of eyes never hurts.