So he wears sunglasses in the store and his excuse is that it's what cops do?
I think the real reason is he's seen Cool Hand Luke one too many times and was dropped on his head when he was a baby.
Seriously, do not let that man make apprehensions in your store because I'm pretty sure Best Practices will be replaced with NYPD style Abner Louima tactics.
After all the police do it.