There are several free online courses on DNA evidence now being offered through the National Commission on the Future of DNA Evidence. You do have to register, but the process is quick and easy.
There are three course directed to the law enforcement audience. Two are general familiarization courses while the third delves more deeply into DNA evidence collection. There are more than a dozen additional classes for prosecutors and analysts.
Feel free to check these out. Free training is rarely a bad thing, and since it is online, you can squeeze it in at the station between calls.