The problem is collecting device info as the person makes their way through security. The PNR shows who's traveling but what devices they're carrying. Tracking down individual's information is easy. It's linking them to specific device info that might be harder. Phones are easy, thanks to phone metadata. Laptops and tablets would be a bit more difficult.
RE: INVESTIGATION OF CLAPPER FOR ALLEGED DISCHARGE OF UNTRUTH
The Office would like to direct the esteemed members of the House Judiciary Committee to the following Fact Sheet, which should clarify the many misconceptions surrounding James Clapper's supposed misrepresentation of his own words.
1. The NSA, along with the ODNI, has always self-reported all potential mistruths. Even when we don't.
2. Clapper answer was not untruthful under this program.
3. Director Clapper's answer was NOT a lie. It was simply a matter of the director "playing to the edges" of the "truth matrix."
4. If Clapper had answered truthfully, up to 54 terrorist investigations would have been compromised.
5. Contrary to what everyone's saying (including the esteemed members of the HJC), Clapper at no time had access to the content of Ron Wyden's phone calls.
6. Everybody lies to everybody. And once again, at no time did the NSA, nor Clapper himself, collect the content of any French metadata.
7. Clapper's truth-dodging has been held to be legal under current law. Not only that, but his slippery wording is subject to several layers of oversight, both inside the DNI's office and inside the DNI's panic room.
8. For all we know, Snowden has millions of sensitive documents and hates America. Therefore, you must acquit.
9. If anyone can suggest a better way to fight terrorism than Clapper lying to Congress, we'd be more than happy to discuss those ideas.
10. Once again, James Clapper is only lying, not collecting sensitive content from domestic end-to-end calls. Do we really have to keep stressing this point?
10.(a) Also not collecting domestic email content (since 2011!).
11. Clapper's desire to lie to Congress is no different than the average American's desire to lie to Congress. Our intelligence officials have the same concerns about privacy the rest of you little people do, only we can actually do something to protect ours.
Oh. And Clapper probably didn't actually lie.
We hope these Guidance Points will help you arrive at the correct conclusion pursuant to your investigation that we won't be assisting with one bit.
Sincerely, Office of the Director of National Intelligence
I believe it's the Lancaster PD. I included a policy statement (PDF) from the Manheim Township in the last post, but the quoted PD statement (added in the update) was from someone referred to as simply "city police spokesman." (That's the same spokesman quoted in this post.)
So, the Manheim policy may be irrelevant, but in both cases, this appears to involve Lancaster City PD.