What is the test for proving intent in a criminal case?

Is there any case law where gang evidence has been admitted in a murder case to prove motive and intent? (California, United States of America)

When a defendant is convicted of a charge of assault with intent to pervert the course of justice in a criminal case, is he entitled to full custody credit in the felony case? (California, United States of America)

Is there any instructional error in general criminal intent instruction used by the trial court to include counts 4 and 7 in the General Criminal intent instruction? (California, United States of America)

Is there any error in instructing the jury that the prosecution does not need to prove motive but must prove specific intent to assist, promote, or further criminal conduct by gang members? (California, United States of America)

Is a parent, relative, or co-habitant of a defendant in a criminal case outside the scope of marital privilege in criminal cases? (California, United States of America)

What is the test for admitting evidence of criminal intent in a criminal case? (California, United States of America)

What constitutes substantial evidence of criminal intent in a criminal case? (California, United States of America)

Does a new criminal conviction for a charge of possession of a drug with intent to commit a criminal offence violate subdivision (e) of the Criminal Code? (California, United States of America)

Does a defendant have to plead and prove his intent to commit a criminal offence under section 1170.12 of the California Criminal Code? (California, United States of America)

Does a finding that defendant harbored criminal intent separate and distinct from that of receiving stolen property constitute a separate criminal intent? (California, United States of America)