My parents think I'm on drugs, what do I do?

Last weekend my parents went to the lake house and I was left home, while they were gone my mother’s bottle of Lunesta went missing from under her sink. They insist that I’m on drugs and had me take a drug test, they’ve searched everything I have and have taken all of my electronics. I don’t really know how to cope with this because I’m telling the truth and they won’t believe me. One thing that fuels their suspicion(sp?) is that when they called to check up on me I sounded strange, the only reason why was because the first time I was sleeping and the others were because I was on XBOX Live in the middle of a game without the ability to pause it. What are some of your suggestions, oh wise collective?