The policeman asks the ER physician to get a sample of this patient’s gastric contents for analysis

A 29-year-old man is brought to the ER by a policeman. He was driving his car under the influence of alcohol. The policeman asks the ER physician to get a sample of this patient’s gastric contents for analysis. The physician explains the procedure to him but the patient refuses to go through it.
What is the best next action?

A-Force the patient to do the procedure
B-Respect the patient’s wishes and don’t do this procedure
C-Convince the patient falsely that this procedure is part of treatment and do it
D-Inject the patient with anesthesia and do the procedure