If I was arrested as a passenger because of marijuana in the car can I be forced to take a urine test a month later?

You can never be forced to take a urine test. However, remember that refusing a request of a court, police officer or prosecutor may have consequences. Depending on the circumstances the test may help you. This is something that should be discussed with your lawyer. You need to understand why you are being asked to take this test and what are the possible benefits and consequences.