The legislation, known as SB 1140, will allow taxpayer funded adoption agencies to cite their "religious or moral convictions" to refuse to allow LGBT people to adopt.
Fallin has vetoed gun bills before.
Supporters of the bill stressed that the state's foster care system is "overloaded".
The Family Equality Council, which advocates for LGBTQ families, said in a statement that the Oklahoma law targets the gay community and encourages religious-based adoption agencies "to discriminate on the basis of their belief that LGBTQ people should not be raising children". The Republican governor, whose stint in office ends this year, warned that the bill would eliminate "the current ability of Oklahoma law enforcement to distinguish between those carrying guns who have been trained and vetted, and those who have not".
Most Rev. Paul S. Coakley, Archbishop of Oklahoma City, and Most Rev. David Konderla, Bishop of Tulsa, said they were grateful for the governor's support and they believe nothing changes in the adoption or foster care process with the bill's signing.
The NRA had supported the bill's passage and had urged Fallin to sign it. Oklahoma's leaders must live with that, and live with the reputational fallout that it may bring.
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"While we are deeply disappointed that Governor Fallin choose to sign discrimination into law, we are more concerned about the children - desperately looking for homes - that will be harmed by this disgraceful legislation", said Troy Stevenson, Executive Director of Freedom Oklahoma.
"Oklahomans believe that law-abiding individuals should be able to defend themselves", Fallin said in a statement.
But as INTO previously reported, Catholic groups have been strong-arming state lawmakers into passing anti-LGBTQ adoption bills by threatening to close up shop if the discriminatory laws aren't introduced.
"I might not be standing right here on a invoice as controversial as this if I did not consider it might assist extra youngsters to get into loving houses", Deal with mentioned throughout a typically testy debate close to the top of the legislative session earlier this month.
Before Fallin signed SB 1140, the legislation wasn't the only state anti-LGBT adoption bill headed toward becoming law. We hope that other governors, most immediately Kansas Gov. Colyer, will not follow Oklahoma's example and will put the needs of the child first.
The new law makes it legal to deny placing children in LGBTQ homes based on "religious objections".