California, United States of America
The following excerpt is from People v. Ayon, D064994 (Cal. App. 2015):
Also, we are mindful that once a witness testifies, the privilege against self-incrimination is waived with regard to relevant cross-examination. Any other rule would result in a distortion of the judicial process. Thus, while direct examination might be tailored to avoid self-incrimination, reasonable cross-examination might not be so benign. (See Mitchell v. United States (1999) 526 U.S. 314, 321-322.)
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