California will become the first USA state to allow employers, co-workers and teachers to seek gun violence restraining orders against other people.
But Newsom, who took office in January, said the law is needed "as other states and the federal government go backward, restricting reproductive freedom".
The Humane Society of the United States, a prominent animal rights group, celebrated the ban.
The law also bans disposing cigar and cigarette waste at parks and beaches.
Seventeen states and the District of Columbia have laws similar to California's current law.
Democratic Gov. Gavin Newsom announced Friday he had signed the legislation.
Irwin also authored related legislation requiring law enforcement agencies to develop written policies and standards for seeking gun violence restraining orders.
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It would claim World Rugby regulations allowed for the game to be moved or rescheduled under the force majeure clause, but opted not to do so.
California's ban will go into effect in 2023.
"After three years of working to expand access to medication abortion at our public universities, I am thrilled that Governor Newsom rejected the misguided paths that other states have taken in limiting access to abortion care", state Sen.
Medication abortion involves taking two pills - mifepristone, which stops the production of progesterone, and misoprostol, which induces a miscarriage-like abortion - over a 48-hour period. Supporters of the SB-24 say this bill supports many students, especially low-income and first-generation students who are unable to pay for the medication out of pocket and do not have ready access to a auto or other means of transportation.
Lila Rose, president of the anti-abortion group Live Action, tweeted that with the bill's signage, "Instead of empowering women with life-affirming options, CA is telling young women they aren't strong enough to succeed without killing their children".
Under the new law, California will phase out the use of these for-profit, private detention facilities by 2028.
The Food and Drug Administration states that the most common form of medication abortion is "safe and effective", and multiple studies have found complications associated with the procedure to be very rare.
"By ensuring that abortion care is available on campus, college students will not have to choose between delaying important medical care or needing to travel long distances or even missing classes or work".