So long Fourth Amendment - Supreme Court: No warrant needed if police discern destruction of evidence
As they approached, police noticed a strong odor of marijuana coming from under the door on the left. They assumed the suspect was hiding in that apartment. (In fact, he had entered the door on the right.)
Police knocked on the door on the left, announcing their presence. When no one answered, they pounded on the door. After hearing noises suggesting evidence was being destroyed, the police kicked the door open.
Say goodbye to the Fourth Amendment, in a non-emergency case your rights are now contingent on what the police think or say they can smell or hear from behind your door.