Comment by mikeweiss

In New Jersey a great example of this are the mobile DMV units... extremely small towns with no major highways invite the DMV unit in once a month to setup checkpoints to check car inspection stickers on local roads.. which then leads to full blown police stops and tickets for other violations. It's a huge monetary boon for the municipal budget for a town that other wise doesn't have an opportunity to pull cars over. It's all about the money and definitely not about public safety or emissions.