Individual Security Checks Are Needed Even For The Vouched For

Individual security screening is needed for all parties, even those supposedly immediately trustworthy.

Time traveling criminals often raped each and every woman in the universe, even simultaneously, knowing that this would give them sexual "access" to the societies those women, and their descendants, belonged to.

The friends and family members of those who have had their access to technology restricted because of probable connections to time travel crime, are often, knowingly, or even unknowingly, attempting to gain technological access for those connected to time travel crime from newly acquiring, unaware societies.