Beyond the Truth by Bruce Robert Coffin

He's chasing down two robbers, first by car, then by foot.  When one pulls a gun on him, he shoots back.  He kills the shooter but they find no gun at the scene.  Suddenly the cop finds himself under fire for shooting an unarmed boy.  His fellow cops believe him and think the second suspect took the gun with him.  The administration is trying climb further up the ladder and is ready to sacrifice him.  The cop is between a rock and a hard place...

Witness Impulse and Edelweiss allowed me to read this book for review (thank you).  It will be published October 30th.

This is a story that points out just how much can go wrong with politicians that want to advance themselves and parents that will lie for their children.  With no support from management, a school that won't let the cops talk to the students, and a hit out on the cop, it's almost impossible to solve this case.  But they don't give up...