California · Evidence Code

EVID §790: Evidence of the good character of a witness is inadmissible to support his credibility unless evidence of his bad character has been admitted for the purpose of attacking his credibility.

What this law says, in plain English

Witness character evidence supporting credibility is inadmissible unless the opposing party introduced bad character evidence attacking that witness's credibility first.

Read the full statutory text
Evidence of the good character of a witness is inadmissible to support his credibility unless evidence of his bad character has been admitted for the purpose of attacking his credibility.

Verify at the official source: California legislative text

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