President Trump’s

plan to arm selected teachers

has already been in effect for years in several Missouri school districts, it was reported Saturday.

Aaron Sydow, superintendent of a district in the city of West Plains, told USA Today that it’s “sad that it’s come to this” but necessary.

Teachers interested in carrying concealed weapons go through 40 hours of training — which also includes a psychiatric evaluation.

Those who pass must also undergo 24 hours of training every year.

He declined, for security reasons, to say how many teachers at his K-8 school, are armed, but said there are “several.”