This is exactly why Power Shot is so terribly paranoid about his own belongings.

He recommends purchasing locks for your personal belongings, as he has in case his own roommate forgets on accident to leave the door unlocked in his dorm room. He then recommends informing your roommates that if habits do not change than you have absolutely no problem changing the locks when they are out to make sure that the house is secure. Let them know security is very important to you, and their convenience must take a lesser stance in the matter.

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Signature by the Sinfully Delicious Lady Knives