Exactly the way I would perceive it to work.Anyone who has worked in radio sales or radio management knows that there is lots of local, state and national paid advertising for specific purposes. While those "Smokey The Bear" spots are Ad Council productions and run for free in unsold times, many campaigns are paid and specifically targeted just like an ad for a car or an airline or whatever.
Those campaigns usually come through a recognized ad agency or an agency's buying service. They do the same as all agency buys by asking for a quote based on the schedule they want.
When I was a GM in Puerto Rico, about 8% to 10% of my revenue came from local and federal government campaigns.
And if a station refuses one government campaign, they would have to refuse all government campaigns.
The analysis I saw is that the cost of advertising "self deportation" is less than 10% the cost of apprehending, temporarily housing and transporting "home" of a comparable illegal immigrant. Of course, that is the government's own evaluation and subject to skepticism, but even logic indicates that running some ads that result in self-deportation is a cheaper way of removing illegal immigrants from the country.
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