Maggie is arrested after a police officer asks for a forced draw of blood from a suspected DUI driver. Maggie tries to use hospital policy as a justification. Sharon the administrator tells Sgt. Voight that hospital policy prohibits them doing so, and she later expresses fear the hospital could be sued if they performed a force draw. Since Illinois law allows for forced draws, hospital policy would be legally irrelevant. The Illinois Supreme Court has held that forced blood draws in cases of traffic accidents with injury or death are legal. In addition, 625 ILCS 5 of the Illinois Vehicle Code protects medical facility staff from civil litigation in cases of forced blood draws unless the act is performed in a "willful and wanton manner". That means a course of action that shows an actual or deliberate intention to cause harm or which, if not intentional, shows an utter indifference to or conscious disregard for the health or safety of another, so Sharon's lawsuit fear was in fact baseless.
Dr. Charles places a patient on an involuntary psychiatric hold because he (Dr. Charles) believes the patient has already tried to commit suicide. The patient is placed in a locked room for psychiatric observation; yet he is allowed to retain his necktie, his belt, and his shoelaces. There is no way a patient under psychiatric observation for having attempted suicide would be allowed to keep these personal items, which he could use to hang himself.
When nurse Maggie is assigning patients at the beginning, she calls for "Dr. Choi and Dr. Reese" to handle the man pulled from the fire. However, as already established (and also pointed out by Dr. Charles in a later scene), Sarah Reese is only a 4th year medical student. As such she does not yet have a medical practitioner's license, i.e. she's not a doctor yet.