You're a rookie cop, with three years on the job, and you know Freddie Gray as a small-time drug dealer. You've seen him get arrested before; once he tried to kick out the window of a police vehicle. On this day, he's arrested by other officers and loaded into the back of a police van, protesting — perhaps rightly — all the while. He proceeds to throw an epic fit, rocking the van. Several stops later, you check on him, and he indicates he needs medical attention. You don't see any obvious injury, you know his history, and you know that no one wants to go to jail. You also know that a hospital trip will mean hours of sitting around instead of policing and that the department is perpetually short staffed. Add to that the likelihood that Central Booking won't take him if he's complaining of injury.