What year is this? That kind of stuff can just be transferred via the Internet. It doesn't have to physically be transferred across the border.

Then we better put up a great firewall.

Also... Malware is not illegal. Using it can be.

Then "randomly" and arbitrarily searching people's devices as they cross the border isn't really an efficient way to do it, unless you also set up an intrusive firewall to "protect" the U.S. from malware.

I mean, not really unless they open it up and run antivirus software on it.

And even then it would only find things they already know exist, which would mean they're already in the country more than likely.