This is happening because it's drilled into managers' heads that one bad hire is disastrous for the team/company. So the cost of a bad hire exceeds the cost (to

This is happening because it's drilled into managers' heads that one bad hire is disastrous for the team/company. So the cost of a bad hire exceeds the cost (to the company) of implementing arbitrary amounts of screening to make sure bad hires are caught -- even when you take into account the effect of a very high false positive rate prolonging the interview process.