My question involves search and seizure law in the State of: Minnesota
Officers arrive at a residence to arrest a suspect for a PC felony.
Officers knock on door and no one answers. Suspect's vehicle is not in lot or driveway. Officers have no reason to believe suspect is in residence.
Officer have key to residence and make entry into the residence in the guise of doing a "welfare check" on suspect.
While officers are in residence they find a "weapon" and take into their custody for safe-keeping. Officers do not leave reciept of property taken.
Officers return a couple days later, knock and no one answers. Suspect's vehicle is not in lot or driveway. Officers have no reason to believe suspect is in residence.
Officers make entry into the residence again and find a "weapon" and take it into their custody for safe-keeping. Officers do not leave reciept of property taken.
I am assuming this is a clear cut violation of the suspect's Fouth Amendment right against unreasonable search and seizure. There was no arrest warrant, no search warrant but officers desire to arrest and using "welfare" check to gain access into residence and then take property because it could be used as a weapon.
Am I correct in thinking this is wrong and illegal of officers?
What agency would investigate this type of incident?

