If a neighbor suspects that a tenant in an apartment complex is consuming marijuana, because they claim to smell it, can the landlord or police go inside to look?
No - a landlord may not enter the apartment to look. Additionally, if the police enter to look absent a search warrant with sufficient probable cause, then the evidence and charges will be thrown out and the tenant whose constitutional rights were violated by the illegal search can file a civil suit against the police department.
The landlord can enter the premises in a non-emergency under whatever (reasonable) terms of the lease may provide. If the matter isn't addressed in the lease, there is a statute that provides that right. However, non-emergency entrance typically requires 24 hour notice. Moreover, the landlord cannot rifle through the tenants belonging - the reason for entrance has to be related to the business. The police may use the witness statement to obtain a warrant to conduct a search.
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