Los Angeles Dodgers minor league outfielder Andrew Lambo, a Newbury Park High graduate and two-time Ventura County Player of the Year, has been suspended 50 games by Major League Baseball for a second violation of baseball’s drug policy.

Lambo has twice tested positive for a “drug of abuse in violation of the Minor League Drug Prevention and Treatment Program,” according to a statement released by the commissioner’s office on May 1.

The ban was effective immediately.

Baseball’s rules require a suspension for a first positive test for performance-enhancing drugs. First-time offenders in the “drugs of abuse” category are not subject to suspension.

Various media outlets have reported that Lambo likely tested positive for marijuana.

In a text message to ESPNLosAngeles.com’s Tony Jackson, Dodger general manager Ned Colletti wrote: “Obviously we’re disappointed to learn of the test results and we hope he will use this time to evaluate the decisions he has made and learn from this experience. And we will certainly use this time to help him work out his challenges.”

Prior to his suspension, Lambo, a top-10 prospect within the organization, was tearing it up for the Dodgers’ Double-A affiliate Chattanooga Lookouts.

In 76 at-bats, including time as the team’s cleanup hitter, Lambo batted .342 with seven doubles, two home runs and 13 RBI.

During the preseason, there was talk that Lambo could supplant Manny Ramirez in the Los Angeles outfield in 2011.