Delivery companies such as FedEx and UPS rely on a risk-based strategy. They hope to detect illegal or dangerous shipments by spotting something unusual about the package or the shipper. ... FedEx and UPS say only that they have security measures in place and cooperate with law enforcement.

Does UPS open and inspect packages?

UPS reserves the right to open and inspect any package tendered to it for transportation.

Does USPS check packages for drugs?

Postal inspectors can screen packages to check for drugs like marijuana and other substances. ... To be able to inspect a package, a postal worker or inspector must usually obtain a search warrant based on a reasonable suspicion that the package contains something illegal.