All officers need a warrant to enter private property unless they have probable cause that a crown offence is going to be committed (IE murder/suicide). Being t

All officers need a warrant to enter private property unless they have probable cause that a crown offence is going to be committed (IE murder/suicide). Being that advertising is at most a civil offence, the police would never be able to enter the interior of a persons property without a warrant and any entry and removal of property would open the police up to the easiest case of a suit against them for illegal search and seizure, any charges laid against the individual would have to be dropped as the evidence wouldn't be viable in court and the police could face up to 6-figure claims against them.