tipster #2
いかに金に困ったとはいえ…なんともはやです。tipsterは「(競馬・相場などの)予想」を意味しますが、そこから「〔犯罪捜査などで〕情報提供者」（"a person who gives useful information to someone"--Webster）をも意味するようになりました。（Ume）
Police: Man stole brains, sold them on eBay
The details sound like the plot of a bad horror movie: Desperate for cash, a young man breaks into a warehouse to steal the brains of dead mental patients, and the body parts are later sold on eBay.
This story line, however, is real.
Authorities say David Charles, a 21-year-old Indianapolis resident, is accused of breaking into the Indiana Medical History Museum multiple times last year and stealing jars of human brain tissue and other preserved material. A tipster who paid hundreds of dollars on the online auction site helped bring the organ entrepreneurism to an end.
