This isn't actually true, because interference is illegal ONLY when you physically obstruct or deceive officers - warning others about police or ICE presence is speech that courts protect as a First Amendment right.
A federal judge in Missouri barred tickets for drivers who flashed headlights to signal a speed trap, the Supreme Court in Houston v. Hill affirmed the right to challenge police verbally, and other federal rulings in Florida and Tennessee reached the same conclusion.
Alerting neighbors that agents are around is expression, not obstruction. And case law protects it in case they want to try (though this is becoming increasingly irrelevant, which - at the same time - makes our social contract to honor such institutions proportionally irrelevant)
Alerting people of traffic checks does not directly encourage them to engage in illegal acts. Telling people to hide from the police when there is a legal reason for detention on the other hand does.
You’re going to have to make a convincing argument that alerting people of a traffic cop isn’t the same as alerting people of police presence in general, and that the merits of one has more weight for the usage of someone already committing crimes.
As it is, by batting for the legality of alerting traffic checks, you’re already batting for the alert and notification of police presence - because that’s what traffic checks consist of
Courts are not stupid. You're not "altering people of police presence in general" when you're making or participating an app that is clearly intended to help people facing the legal consequences of their actions.
You still need to generate a convincing argument that "alerting people of police presence in general" has any more weighted use from criminals, to avoid legal consequences, than speeding trap alerts - which we already have settled case law for. You have not done so.
A federal judge in Missouri barred tickets for drivers who flashed headlights to signal a speed trap, the Supreme Court in Houston v. Hill affirmed the right to challenge police verbally, and other federal rulings in Florida and Tennessee reached the same conclusion.
Alerting neighbors that agents are around is expression, not obstruction. And case law protects it in case they want to try (though this is becoming increasingly irrelevant, which - at the same time - makes our social contract to honor such institutions proportionally irrelevant)