Backlog drops from 403 to 3,211 in March 2012 , report says . `` The FBI told us that there have been no documented instances for which probative results were generated from these mitochondrial DNA examinations , '' said the report . CNN lab tests biological evidence found at crime scenes for FBI , other agencies . Report attributeds improvement to increased use of automation , more staff .
Backlog drops from 403 to 3,211 in March 2012 , report says . CNN lab tests biological evidence found at crime scenes for FBI , other agencies . Report attributeds improvement to increased use of automation , more staff .