Well actually for the BPs to be checked as often as possible is very good. Increases security and safety and minimises delays. Ive seen instances where passengers have boarded wrong flights and slipped through the net plenty of times only for the crew to send em back.
Whats wrong with airlines increasing security. If a wrong pax boards a flight its a security concearn! I have seen skippers offload whole flights for this, just like if a pax takes ill on board the surrounding area must be searched heavily.
Just my two cents worth!