I am aware of that, I just wasn't aware that you can just ship that stuff worldwide by mail so easily..
Both heat sealed and vacuum sealed are air-tight, so that difference should be a non-issue. Its the stuff sticking to the outside of the bag that might be an issue. For meat I'd imagine bleach should do the trick...no idea what you'd need to remove drug traces though. Not a skillset I plan on deploying anytime soon so didn't research it.