Lots of that going on.
The great damage that’s being done by illegal immigration is the structural breakdown of most of the systems needed for effective law enforcement. When Joe Citizen gets a ticket, the court knows how to find him and he knows the court knows, so he shows up in court or plays the fine. When an illegal gets a citation, the address on his documents usually isn’t where he lives, the name is frequently one of four or more, etc. So you have all these people who break the law with impunity because nobody knows who they really are or where to find them. The terror community is going to take advantage of those established false ID networks and other systems for maintaining anominity, mark my words.
The Texas license plate tipoff in your story reminds me of the old days when the Columbian drug cartels were trying to get established in our town. They kept getting arrested within 24 hours of crossing the city limit. It took them almost a year to figure out how the cops were spotting them. Pretty simple, actually, we had one hotel and the desk clerk was instructed to drop a dime anytime somebody “swarthy” checked in and paid cash.
OMG, they are stupider than I thought. The stupidity of these people is breathtaking---including their inability to circum-navigate the US political system.
They sorely underestimate Americans' resistance to being overrun by freebie-sucking illegals, especially those engaged in drug crimes.