dude if you really want to be paranoid about it heres what you do.
1)obtain a jar of peanutbutter
2)take off the freshness seal thing off whole and scoop out the peanut butter in the middle of the jar.
3)seal your salvia in a ziploc or vac seal it,note put on bag over the main bag so the peanut butter wont even touch your other bag.
4)put in the middle of the peanut butter and cover with peanut butter.
5)very important, super glue the freshness seal back on to the jar, very important not to damage seal,and put the lid on

I like doing this cuz it gives me a false sense of security