State witness tampering statute is not categorically a crime of moral turpitude, since it encompasses a wide range of conduct. Under modified categorical review, the conviction for knowingly inducing a witness to be absent was not a valid predicate.
http://cdn.ca9.uscourts.gov/datastore/opinions/2018/08/10/13-74213.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.