Does hydrogen peroxide help you to pass a test in your mouth?

My cousin was on probation for a year and he said his p.o told him peroxide works so he did it and passed every time. I actually recall smoking with him and shortly after took him to probation and he passed! I'm on probation now and I have to get tested next week so I am definitely gonna do it! He is living proof that I witnessed so I feel I can't go wrong!