No, it is not common but does happen. There are several cases on drug testing, DNA, bite mark, and software that comes to mind. Scientifically well established processes, tools, etc. are rarely called up.

Bite mark was a big deal in the industry because it turns out, it is not so unique and the methodologies developed were weak.

My personal opinion why the are resisting? They are resisting because they are bottom dwellers. Forensicators whom I associate with, tool vendors, and I understand that we have to share knowledge. I dare say, we are the most open source scientific knowledge industry.

This is not because of some altruistic reason, but because tomorrow they can be called on to explain.