There's the assumption, when getting tissue, that it has been inspected and that it is safe.

I just operate on the assumption that all phone conversations are bugged.

IT'S A SWORD, said the Hogfather. THEY'RE NOT /MEANT/ TO BE SAFE.

I had a touch, like a headache, when I was going through there, so just to be on the safe side, keep the kids out for the day.

The coward threatens when he is safe

When a paper comes in from South Korea, you have to make the assumption that they are telling a true account. It is not a system for policing. It's a system for detecting whether the science seems good. It cannot be a system for policing.