If you still have power flowing after turning off the light switch you need to call an electrician. It's not a function of the bulb, you have either faulty wiring or a faulty switch.
This has been know about for decades. Hell when I was in college in the early 90's one of my intro microbiology labs involved taking samples from the bathrooms, including sampling the air from the hand dryers. It's the reason I skip hand dryers to this day.