Why Bruce Jenner Won't Be Prosecuted?

If you're a gambler, you should bet that Bruce Jenner will NOT be prosecuted for vehicular manslaughter, because his screw up was driving HUA ... law enforcement sources tell TMZ.

Sources familiar with investigating the fatal crash on PCH earlier this month tell TMZ ... conventional wisdom is 60/40 AGAINST criminal prosecution. One source says it's more like 70/30.

As for why it's looking like Bruce will not be prosecuted, TMZ law enforcement sources say there are a variety of factors:

-- He was not under the influence

-- He was not speeding

-- He was not texting 

As one source put it, "It's more a case of HUA" ... that's cop talk for driving while head up ass.  That we're told is the view shared by cops familiar with the investigation.

The underlying offense could be following too closely or driving at a speed that isn't prudent given driving conditions.

We're told the L.A. County Sheriff's Dept. investigation is pretty much complete, and after the reports are written it will be submitted to the L.A. County D.A. for review. Our sources say the Sheriff's Dept. in all probability will not make a recommendation on prosecution.

Culled From TMZ