[Ellesu]

In Baton Rouge, La., in 2003, authorities trying to find a serial killer took swabs from 1,200 white men who drove white pickup trucks, but the dragnet did not yield a suspect; a black man was later arrested using other investigative methods...

http://www.2theadvocate.com/stories/010805/new_dna001.shtml

[Ellesu]

In BR they told all those who volunteered to give swabs, their sample would be destroyed once they were cleared, or given back to them.

From the above link,

authorities have kept the DNA swabs of the other men and are storing the genetic information in government databases that can be used by law-enforcement agencies investigating other crimes.

[Condor51]

***In Baton Rouge, La., in 2003, authorities trying to find a serial killer took swabs from 1,200 white men who drove white pickup trucks, but the dragnet did not yield a suspect; a black man was later arrested using other investigative methods...****

That caught my eye too.
Chief Moose must have been consulting.