Fourth Amendment: Search and Seizure

Sgt. Serna is on patrol and receives a loud music complaint at Michaels house. As Sgt. Serna approaches Michaels front door, he smells burnt cannabis, and through an open front window, sees three people snorting a white, powdery substance.

Instruction:

Considering this scenario, critically analyze if Sgt. Serna can take action to seize the contraband based on the three requirements for plain-view. Be sure to specifically analyze each of the three requirements of plain-view and relate it to the sergeants actions, illustrating whether the requirements have or have not been met.