How have courts interpreted the "plain view" doctrine in the context of drug seizure cases?

Moreover, the gun was in plain view because the gun butt protruded six inches outside of the box. The methamphetamines were in plain view in the box. "It is well established that under certain circumstances the police may seize evidence in plain view without a warrant." Coolidge v. New Hampshire, 403 U.S. 443, 465 (1971). Those circumstances include "situations where the initial intrusion that brings the police within plain view of such [evidence] is supported ... by one of the recognized exceptions to the warrant requirement." Id. "[T]he 'plain view' doctrine has been applied where a police officer is not searching for evidence against the accused, but nonetheless inadvertently comes across an incriminating object." Id. at 466 (citations omitted).