Waldo Mejia was charged with randomly killing Caleb Rijos, 14, accused of stabbing him twice in the chest at E. 138th St. and ...

in court after cops said he randomly plunged a knife into teen Caleb Rijos’ chest — shows the dire need to change the state’s involuntary commitment laws, pols and lawyers told The Post.

In news that will (tragically) surprise no one, monstrous killer Waldo Mejia will escape for the moment a criminal trial over his vicious, random murder of Bronx 14-year-old Caleb Rijos.

Waldo Mejia, 29, was sent back to a psychiatric facility where he’ll remain until he’s deemed fit to be tried for the murder of teen Caleb Rijos, according to prosecutors. The ruling Thursday ...