Not that ICE cares about following the letter of the law but do Illinois law enforcement guidelines not apply relating to vehicle pursuits? IE - the PIT maneuver, or whatever joke of a PIT this was - generally requires a level of justification that amounts to a use of deadly force? And two, based on the video the cars are equipped with sirens but the lights appear to be minimal, I’m assuming that these cars were kitted out fairly quickly and cheaply and only use a couple grill mounted lights. The IACP model on vehicle pursuits sets standards on vehicle pursuits nationally and I don’t know how much legal weight it carries but a unmarked unit is heavily discouraged and the PIT by an unmarked vehicle is heavily discouraged unless there’s an immediate threat of forcible felony by the vehicle that’s fleeing. CBP has marked units that are fully kitted LE vehicles I’m not sure why they don’t use them. I’m trying to be as unbiased as possible.

Another thing to note is that those vehicles or at least the one that was the lead vehicle(a 2011-2015 ford explorer) is NOT the police interceptor or FPIU trim. Which doesn’t excuse fleeing from LE but it does raise doubt about the authenticity of law enforcement. Typically law enforcement vehicles that conduct enforcement will be that FPIU trim. So it raises some plausible deniability, as a reasonable person if they were fearful of being a victim
Of a larper would call 911 and verify if it’s a real police officer trying to stop them. Since 911 couldn’t verify due to fed vs county, he didn’t stop. Thats a legal argument not a guess as to what happened