EXCLUSIVE
Dustin Diamond a.k.a. Screech is behind bars ... after he was arrested for allegedly endangering someone's life in Wisconsin with a switchblade -- TMZ has learned.
The Ozaukee County Sheriff says Diamond was arrested early Friday morning for possession of a switchblade, reckless endangerment and carrying a concealed weapon.
Details surrounding the "Saved By the Bell" star's arrest are unclear at this point ... but one source tells us he was taken into custody after getting into a bar fight.
Diamond's bail is set for $1K ... and as of this post, he hasn't bonded out.
