I guess the reason is that female policemen (*shades emoji*) can recognize bad guys and good guys. They'll feel intimidated near to guys that effect them negatively or sexually arise themOne thing I learned not too long ago is that female cops are nicer to men and male cops are nicer to women. Idk why but something that was pointed out to me and I noticed it ever since.
I had a nice police girl recently in my building doing some job, when I looked her into the black of the eyes (narcissistic behavior during coronavirus lockdown my bad) she probably would not treat me as nice as other men
Actually male policemen also have this ability, they are even nicer then female if you act like a man