It is a felony under California Code § 7052.
This section was enacted almost as-is in 1939 by Stats 1939 ch 60.
The amendments since enactment were by Stats 1993 ch 1232 § 19 (AB 598) and Stats 2004 ch 413 § 1 (AB 1493).
* In 1993:
> (1) Added "willfully" and the comma before "without" in the first sentence; and (2) substituted ", under authority of law, removes the remains for reinterment, or performs a cremation" for "removes the remains of a relative or friend for reinterment" in the last sentence.
* In 2004:
> (1) Added subd (a) designation; (2) substituted "interment, or commits an act of sexual penetration on, or has sexual contact with, any remains known to be human, without" for "interment any human remains, without" in subd (a); and (3) added subd (b).