Trophy Keeping by Killer?

Freud said he thought criminals confessed as a way of re-living the 'thrill' of the crime.  It is also sometimes incredibly stupid. How bright was it for Casey Anthony to get a celebratory tattoo after killing her 2 year old?  Gangster's Crime Scene Tattoo Leads to Murder Conviction in 2004 Cold CasePublished April 22, 2011| FoxNews.com  (Los Angeles County Sheriff's Department)Authorities are