I noticed the same comment and it struck me as incredibly stupid.
USA post offices look for abnormal packages. Most drugs are sent in unusual packages so they are opened searched and resealed. If the tape said "GOD'S LAST STAND!" or "HAIL MARY!" you would have seen the same problem. One of those would have made for a better control.
I have my doubts about the drug thing. Why would people send their drugs in packages that look suspicious? Of course, if the post office only searches suspicious packages, all the drugs they'll find will be in suspicious packages, so mabye they feel like they are on the right track...
Now just because it is stupid, does not mean it can't be a real post office guideline.