Well, if you actually read up on the matter, you will find that it was actually his agent that created all the media hype around the police wanting to question him by pulling him from being physically present at the draft to "consult with the agency's lawyers and private investigators." His agent then drew even more media attention by making the ridiculous statements that he made about not drafting Collins past the second or third round and begging the NFL to let Collins enter the supplementary draft instead, despite NFL rules clearly stating that was not allowed.
I'm telling you, as more and more information comes out about this, it looks more and more like it was Collins's own agent that screwed him out of a big contract. Not the police and not the media. So if Collins should be suing anyone, he should sue that seemingly incompetent agent he has for grossly mismanaging the situation.
Now, on to the "inside source" for the police that blabbed to the media: While I do not feel Collins should have the right to sue the department over this source's actions, I do feel the department should make every effort to find out who it is and terminate his/her employment. Collins should then have the right to file a lawsuit against that individual as well as his agent. Police should not be discussing details of an ongoing investigation with the media. I know a lot of people would disagree with what I am about to say, but "the people" don't have a right to know such information until the investigation is officially concluded. It is on that basis that I believe the inside source should be rooted out and punished in the manner I outlined above.