When conducting pat-downs and personal searches, be aware that normal-looking headwear can contain hidden pockets with potentially dangerous contents.
A variety of caps and hats are marketed online with concealed compartments, usually inside the crown.
These can be used by law-abiding citizens to hide cash, credit cards, and other valuables while out in public.
For suspects, though, they can be depositories for contraband or weapons.
Our thanks to Trainer Tom Moy of the University of Delaware PD for alerting us to this potential threat.