Does UAE police run night checkpoints/raids on the road, and can mall security refuse entry to visitors?

Mall security guards can deny entry — there was a case where two women were not allowed into a mall, likely over dress code.

Plainclothes police sometimes detain people directly inside malls — one case involved a man being taken away from a mall.

After midnight there can be police raids checking every single car, causing multi-hour traffic jams — reported by someone who has visited UAE for 15 years.