With the statewide push  to combat opiate abuse, the easier an addict can get information that will help them obtain more drugs illegally, the more chances there are for abuse.  I believe the problem is more basic than reading a number off a certificate, but as long as we have the certificate available for proper authorities, that should be sufficient.  I can't remember any time in my 40+ years in practice that someone questioned if I could prescribe drugs to them and wanted to see my certificate.