expected behavior when trusting certificates|OPC UA Standard|Forum|OPC Foundation

I've looked in the specifications (parts 3-6) and in the forum but can't find what is expected when a certificate is in a servers certificate store in the trusted folder and in the rejected folder.  For some reason if someone does not move the certificate from rejected to trusted but copies it what should the server do?  Should it look in the trusted first and ignore that it's also in rejected or maybe look at rejected first and ignore it's also in the trusted folder?

Thanks.