Let me tell you how a taser works: 2 needles are show out of the gun, representing positive and negative electrodes. Each of these needles break the skin, causing an electric current to run between them, instantly contracting the muscles. On a pain scale, its a 10.
Now, if this kid was lying on the underpass, even if it wasn't an accident, he still had a broken back, detached ankle, and a broken foot. Even if he couldn't flag down a passing vehicle, the pain from the broke back and foot, coupled with the blood loss would have made it extremely painful, and would've made him incoherent simply from blood loss and pain.
An educated cop would've come across a kid and noticed he was acting strangely. Now, this is not enough to actually pull out a taser. First off, he wasn't moving. Second, he was incoherent from pain Any self respecting cop would've called an ambulance first off, then asked questions.
The magnitude of 19 tasers to the body is usually reserved for criminals with knives and guns, or angry and violent drunks, but not a kid lying on the ground. It doesn' add up on the cop's part. The fact that it was an accidental fall or a suicide is irrelevant. 19 tases is completely excessive for the situation, and the fact that the cops couldn't tell the difference between a kid with a broken back and a relative threat shows either how eager they are, or how unskilled and stupid they are.