Yet Another Possibly ****** Question -- check to see if a specific root CA is installed

I can use /usr/bin/security to install a root CA, and to delete it (based on the file)... but how do I check to see if it's installed already? Surely there is a way to do this, other than security find-certificate -a | fgrep my.ca.name? Ideally from the shell level, but if I have to write a program I can (in which case I believe it'd be a relatively easy, albeit annoying because I hate writing certificate code, task)...