When UPS finds drugs in a package, they will seize that package.
UPS can “intercept” a package that they feel is suspicious.
UPS reserves the right to open and inspect any package deemed suspicious.
UPS does not require a warrant to search a package for drugs.
(USPS requires a warrant based on probable cause to search a package for drugs.
But private companies like UPS, FedEx, and DHL can reserve the right to open packages.)
Once they have intercepted it, they will contact law enforcement to come to check it out.
Law enforcement won’t need to bring drug dogs to determine if UPS found drugs in a package.
This is because UPS can open the packages and do a “postal inspection service.”
Your tracking information will get updated to say which law enforcement agency seized it.
Note that it could say anything with a private carrier.
UPS drivers type in who signed for the package.
They can write things like, “seized,” “law enforcement,” “DEA,” “U.S. Customs (CBP),” etc.
It will only mention U.S. Customs if there is an importation and forfeiture of drugs.
Related: What States Is Weed Legal In?