[4wsn]

For what is self-labelled as an investigation, there's very little technical information. At the very least (in my limitedly qualified opinion) the main factor should be identified; were all the holsters in the reported incidents leather? The only acknowledgement of the topic is brief.

> as it might be in a warped holster or when a finger or object inadvertently brushes the trigger from its side.

> He added that accidental discharges can be caused by improper ammunition, worn holsters or foreign objects working their ways into the trigger guards.

If this occurred also with plastic holsters, then I'd be concerned. But, unsurprisingly, WP decided to not provide this basic information.

If they're all leather, yes. The holster is a critical part of the weapon system. If you're using a leather holster it has a far more limited lifespan than, say, a leather wallet. RTFM.