1) the handgun safety cert is to buy a handgun, you must also carry it with you if you borrow a gun from a family member or friend.
2) It does not take place of a hunter safety cert.
will post a link to the law that says that you must have cert with you when I can.
on edit...sec (2)
12801. (a) As used in this article, the following definitions shall apply:
(1) "Department" means the Department of Justice.
(2) "DOJ Certified Instructor" or "certified instructor" means a person designated as a handgun safety instructor by the Department of Justice pursuant to subdivision (d) of Section 12804.
(b) No person shall do either of the following:
(1) Purchase or receive any handgun, except an antique firearm, as defined in paragraph (16) of subsection (a) of Section 921 of Title 18 of the United States Code, without a valid handgun safety certificate.
(2) Sell, deliver, loan, or transfer any handgun, except an antique firearm, as defined in paragraph (16) of subsection (a) of Section 921 of Title 18 of the United States Code, to any person who does not have a valid handgun safety certificate.
While I do not think that you would need to carry the cert by law, it would not hurt. just in case.
As they can not check anything except load status.. But you do not want to get a loaned gun taking by the LEO's.