So, yeah. While I did never move up the infosec ladder up far enough to have to deal with law enforcement on a regular basis, I did once, in the early 2000s, hold a presentation on WiFi wardriving at an education institution of the regional police force.
It's also absolutely clear that, as an infosec professional, you cannot have reservations on getting into contact with law enforcement, as far as your job is concerned. Working in infosec is not a vigilante operation, despite unusual freedoms.