Whether or not the suspect is "active and behind cover", you shouldn't be firing, unless you have a reasonable chance of hitting the suspect.
This isn't Afghanistan. You don't use "suppressing fire" on city streets.
And, if you're stupid enough to think a 'suppressing fire' tactic is useful, you better have some friendlies advancing on the suspect. Otherwise, it's just a dangerous waste of a precious, limited commodity: ammunition.
One of my favorite quotes, from a local cop:
"One bullet in the bad guy sure beats 6 in the crowd behind him."
"Such is the strange way that man works -- first he virtually destroys a species and then does everything in his power to restore it."