The cop should have been arrested for assault, not let him go with apologies simply because he was a cop.
The Emergency department would not be without staff. If closed during the night, the doors would be shut and there should be a phone outside from which to call for help.
The protagonist grabs the dead person's right forearm with his own right hand and somehow, both the corpse's upper extremities are flung towards his chest.
Thomas cuts open a dead body and pulls out a condom containing an important item. The condom is clean without any blood or goo.
The policeman has no authority over the Gendarmerie officer. He should have been checked like any other driver.
The French Police and the French "Gendarmerie Nationale" are not the same Corps and historically do not like each other very much. There is no reason why the cop would talk down to the law enforcement "gendarme" but on the contrary try to gain his sympathy.
There are many ways and places to hide a corpse, but the hero, despite being a seasoned police officer, chooses the worst actions.
Two police officers attempt to identify a photographed license plate. The first one says "it begins with a D". The second one says "it begins with an O" to throw him off the scent. French plates never use "I", "O" and "U", so the first cop should have reacted and understood.