"Consultation on some tougher cases," he explained. It was true, she was one of the most powerful telepaths in the world and she would probably not get anything worse out of the shock collar than an annoying buzz and she could probably explode his brain if she wanted. They both knew Nick wouldn't be here if she couldn't do all of that. Which didn't mean, if things turned ugly, Nick would have any qualm with shooting her full of mutant suppression serum or putting a bullet in that pretty little psychic brain of hers. They both knew he wouldn't be Nick Fury if he wouldn't do all of that.
"We'd pay you well, just to come in now and then and extract information our psi-division can't crack. No other obligation to S.H.I.E.L.D."