This was a cool little discovery as we were looking for something to do on a rainy day. Great little museum with an oddball collection of artifacts, case files, correspondence, photos, etc. We spent about an hour here, but probabaly could have spent a bit longer - 2 hrs would be a good amt of time to allot if you want to see everything and read the stories posted, etc.
The museum may not hold the interest of young children, as many of the exhibits require some reading and/or would just not interest young children, and there are confiscated weapons on display, some that may prompt conversations you are not ready to answer about the ugly horrors that humans are capable of inflicting on one another (such as the baseball bat embedded with hundreds of nails, or the axe with hair still visible on the blade that was used by a teenager to murder his family). For the queasy, they do a nice job at the front of explaining how to avoid the body part specimens, etc.