Get on the ground. Get on the ground. >> In Jacksonville, Florida, a man leaves his therapy appointment and ends up mauled by a police dog. No crime, no threat, just another case of mistaken identity. And another police report that doesn't match the video. Now there's a federal lawsuit, body cam receipts, and an officer with a past so dark it makes you wonder how was he even wearing a badge in the first place. >> The lawsuit claims the department's gang unit and K-9 violently took down the wrong man as he was leaving a doctor's appointment. It's interesting. A former JSO detective now serving a 24-year prison sentence for an unrelated sex crime against a child also took part in that takedown on that video and can be seen in the body camera.