In my experience there aren't many cases against government entities that attorneys will take on contingency. A friend of mine was held for nearly 2 years without bail because he was deemed a flight risk (the white collar charges he faced were eventually dropped). He spent most of that time experiencing violent and painful vomiting attacks. He was told he had an ulcer and was given ulcer medication that had no effect on the attacks.

Upon his release, he immediately went to an ER where he was told he had developed gallstones and that it had gone on so long that it was affecting his other organs. His pancreas was on the verge of shutting down. He was told that it was good that he came in when he did, as he would have been dead in another month or so. It was eventually revealed that the gallstones diagnosis had been made by the jail doctor approximately 16 months before his release, and that he had recommended a surgery be scheduled. That never happened and he was never told about the diagnosis. At one point during his incarceration, his attorney requested bail based on the jail's inability to properly diagnose/treat the problem. The prosecutor mocked the request in open court, saying he "had stomach pains sometimes too" and the judge denied the renewed bail request because jail staffers insisted that they were doing everything medically reasonable.

I helped him contact probably 50 attorneys. Not a single one would take the case on contingency, mainly because there was no permanent injury or death that had occurred. The government got away with nearly killing my friend while he was being held without bond on charges that were ultimately dismissed.