Do these people realize how many people use the PATH every day? It's completely unreasonable to think that they could scan even a small percentage of them.

What's more, there's no safe dose of radiation. Making people go through these things with no probable cause is unreasonable.

As for London, the security people for the Tube decided against doing any kind of random searches or scans of people, explaining that it would be totally unreasonable to do given the number of people who use the Tube every day, and the number of entry points to it.