This technology has been around for quite a while. I was able to attend a High Technology Crime Investigation Association meeting because I was helping with the

This technology has been around for quite a while. I was able to attend a High Technology Crime Investigation Association meeting because I was helping with the computer forensics coursework at a local college (featuring a police academy and administration of justice program) and I got to use this very device. They've made it about as safe as can be. You just can't be a complete moron. As long as the data has been handled properly, yes it's still valid as evidence. Hooking a computer up to a UPS in-situ, then plugging in the equivalent of a USB mouse will not invalidate the evidence.