One of the most important things to remember before moving in with someone is to make sure you know exactly who it is that you're living with. A couple USC students were concerned about their roommate and what she was doing while they weren't home. They decided to set up some hidden cameras and what they discovered was horrifying!
wistv.com - Columbia, South Carolina
This video shows Hayley King, allegedly spitting in and spraying windex in another roommates food! According to WISTV.com,

The Columbia Police Department arrested Hayley King, 22, on Feb. 9. She has been charged with unlawful, malicious tampering with human drug product or food, which is a Class C felony carrying a term of up to 20 years in prison if convicted.

When police watched the video, they brought King in for questioning at which point she finally confessed to the incident. The whole reason that this incident occurred, according to King's roommates, was that there had been altercations leading up to this event and they wanted King out. If found guilty, hopefully she faces a stiff punishment for this. She could have killed those girls.