In some cases, this ploy succeeded and the suspect admitted to several murders that the police did not know of , or had not linked to the suspect. The need for attention, or to show off was so great.
The above post seems to refer to sub-clinical psychopaths. Its something we should _not_ be trying to judge - perhaps - we could land up judging normal people as psychopaths, since such methods of judgment _could_be_ error-prone, subjective and may not apply to people from different cultures or upbringing.
You're probably thinking of low-functioning sociopaths, the ones who commit serial murders and get caught. Those people probably do need to show off.
My style is more to post an ad on Craigslist looking for prostitutes, find the real names of the women who respond, and then twirl them around my finger as I threaten to tell their family and friends (and then tell them anyways).
Posting on websites like this is about as much as I need to show off.
There was an article on this topic some time back. Much more elaborate. Someone had done many years of study and came out with the conclusion that there are a large number of psychopaths. Even at home we could have relatives who are "sub-clinical psychopaths". He devised a test, but iirc, he advised others not to follow it, or to take its results seriously. However, it seems people have been using it while recruiting.
http://www.amazon.com/Sociopath-Next-Door-Martha-Stout/dp/07...
http://www.lovefraud.com/blog/2010/05/10/what-sociopaths-wan...