Not while it's at sea. The whole point is illegal containers pass all the way through ports without any knowledge of their contents. We've had fireworks busts at port. You know how many people got charged for that? Zero. No one could be proven to be responsible. And drones don't even need to make it to through the very limited inspections we have at port. Or even travel to the United States at all. San Diego is like 30 miles from a major Mexican shipping hub.
The police and surveillance state will not protect us. Because it is and has always been a sham. Being as secure as you imagine would restrict profit, annoy consumers, and require manpower they don't want to pay for. They'd rather just take the hit and funnel the money through arms manufacturers for the response.
Iran smuggles weapons into freaking Gaza. They have proxy groups around the region they arm and ship these exact drones to Russia. They are definitely not being tightly contained for small arms transfers. The United States has little to no insight into what's actually in any particular shipping crate leaving Iran. We're talking about an actual state actor covert service rather than a smuggling ring. They can definitely get drones out undetected.