I already use a retention holster that cops have trouble with (Safariland 6378, level II retention). The release mechanism is not usually visible to the casual observer, and its operation is only intuitive to the person carrying the firearm. In fact, none of the half dozen officers that have e-checked me have been able to extract the firearm without aid. In the past, I have aided them in removal of the firearm when asked to, but I will no longer do it. It's not my job to help them violate my rights. I may soon buy an even more difficult holster to defeat (Safariland 6360, level III/IV retention, this time with tactical light capability for my TLR-1) to further confuse and confound them. We'll see what happens next time I am e-violated.