Sweepstakes, Contests or instant winner games

We've successfully run many instant win games on the outside of products, and while there is always a risk of tampering, we've never had a client tell us it was a major problem. In fact, many of our clients find this promotion technique so effective , they have repeated it frequently.
I need to know more about your product and how it is sold to give you a more comprehensive answer, but there are many techniques that can help minimize the risk of product tampering, both in the structure of the game and in the structure of the actual game piece. Please feel free to contact me directly if you'd like to discuss further.