I could be wrong but I think the OC spray that the LEOS carry is less potent than good bear spray. Yes, I've heard about some drugged out people whom have been sprayed with little effect. This happened locally a few years ago, they ended up nonfatally shooting the addict with their sidearm.
It depends on the agency and the bear spray. Counter Assault is 2% capsaicin, where some pepper sprays marketed to law enforcement contains 10%. I expect delivery is far more important than percentage of capsaicin.