(Police Question) If a 187 is a murder, what is a 138?

Question

I heard a cop say we have a 138 in progess

Answer 1

I am assuming it is for the State of California.

Try this:

138. (a) Every person who gives or offers or promises to give to
any witness or person about to be called as a witness, any bribe upon
any understanding or agreement that the person shall not attend upon
any trial or other judicial proceeding, or every person who attempts
by means of any offer of a bribe to dissuade any person from
attending upon any trial or other judicial proceeding, is guilty of a
felony.
(b) Every person who is a witness, or is about to be called as
such, who receives, or offers to receive, any bribe, upon any
understanding that his or her testimony shall be influenced thereby,
or that he or she will absent himself or herself from the trial or
proceeding upon which his or her testimony is required, is guilty of
a felony.

Answer 2

I thought 187 meant officer down? I could be wrong.