"If the police want security tapes from a local business, for example, they have always just asked for them. The business isn't obligated to hand them over in that situation, but often does anyway, to be helpful."
I have personally known 3 business owners in the course of my life who cooperated in similar manner with police "requests". They all admitted to me that they did so out of fear of the well-established (and once plainly-communicated) threat of "slower response times in case of emergency".
This is a game cops play with anyone who has something the cops want - hand it over, or else they'll punish you by refusing to do their job (while still eagerly accepting the pay for that job), while still enforcing each and every law against you that makes it difficult or dangerous to protect you and yours.
"The number of Unix installations has grown to 10, with more expected." -- The Unix Programmer's Manual, 2nd Edition, June, 1972