Just equip the vans with one two of these to encourage the culture enhancers to move along...
https://hornblasters.com/products/hornblasters-5-chime-540
"Wakes The Dead, Longest Blast Time."
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Seems our feds are under orders to 'kid glove' illegals. This makes a department with the name 'Security' in its name appear a bit weak and ineffective. Since it worked, look for the illegals to get much more militant about deportation.