My friend's aunt works for USPS and we got to talking about all the weed coming out of medical states and how such a low percentage of packages actually get intercepted.
Long story short, if you've ever had a package with a small hole the size of a pencil or pen punched in, it was most likely a narcotics officer that made it to stick a camera into your package to check for drugs!! So vendors that don't use even a simple decoy, please start using one.
Do you know that a warrant is required to do that and that if what you're saying were true then any "narcotics officer" doing this would be breaking the law and, even if they found drugs, wouldn't be able to use that evidence against you? I don't know why people insist on pushing this probe theory but when we're talking about domestic packages not going through customs and being carried by USPS, it's utter horseshit. Please, please, please stop it.