Jesse Leal Rodriguez, 34, of Anaheim appeared via video for his arraignment inside a Riverside courtroom.
He faces three counts of attempted murder.
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More than 100 people reported their windows shot out by a BB or pellet gun over the past month on Southern California freeways.
Bail was set at $1 million for Rodriguez.
The Riverside County District Attorney’s office expects more charges to be filed against him as the investigation continues.
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