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The successful defense last week of a three-year-old Louisiana law is casting a spotlight on how conservative groups are seeking to circumvent a federal ban on the teaching of creationism in public schools.

The Louisiana Science Education Act, which allows teaching contrary to science on the grounds it promotes critical thinking, is increasingly serving as an inspiration to religious conservatives in other states. Its defenders decry the 鈥渃ensorship鈥� of nonscientific ideas and advocate allowing teachers to teach 鈥渂oth sides鈥� on certain scientific theories.

So far in 2011, similarly worded legislation was introduced in Florida, Texas, Missouri, Kentucky, Oklahoma and New Mexico, but all failed at the committee stage. However, a bill in Tennessee passed the state House in early April and is awaiting a Senate vote in the 2012 session.

In Louisiana, the challenge to the Science Education Act was defeated last Thursday in the Senate Education Committee by a 5-to-1 vote. State Sen. Karen Carter Peterson (D), who authored the bill to repeal the 2008 law, said she received letters of support from more than 40 Nobel Prize-winning scientists.

Senator Peterson told the Associated Press on Tuesday it was 鈥渇undamentally embarrassing鈥� for her state to have the law remain on the books, adding that it would further damage Louisiana鈥檚 ability to attract top talent in the sciences.

The 2008 law gives elementary and secondary school teachers the right to bring materials into science classrooms as supplements to textbooks on matters 鈥渋ncluding, but not limited to, evolution, the origins of life, global warming and human cloning.鈥�

Intellectually destructive

The scientific community has long advocated that allowing anything but science in the teaching of evolution will be intellectually harmful. In an e-mail sent to the Associated Press, Harold Kroto, a Nobel Prize winner for chemistry in 1996, said voting against the repeal creates a situation that 鈥渟hould be likened to requiring Louisiana school texts to include the claim that the Sun goes round the Earth.鈥�

While evolutionary biology is based in the work of Charles Darwin, which shows how humans evolved through natural selection, creationism is rooted in a fundamental reading of Biblical texts that say mankind is the product of a divine maker.

With the law intact, Louisiana is the state that has gone the furthest in approving legislation that opens the door to allowing alternatives to science taught in its schools.

The law鈥檚 supporters deny it was written to push religion in the classroom and that its language is very specific about prohibiting doctrine. Instead, they say the law is meant to provide teachers the opportunity 鈥渢o teach both sides of the equation鈥� regarding certain scientific theories that may need a broader context than what the scientific community insists is fact, says Gene Mills, president of Louisiana Family Forum in Baton Rouge, a conservative non-profit organization that lobbied to keep the law intact.

Schools should 'quit choosing sides'

鈥淲e assert you should be able to critically present that evidence and quit choosing sides when it comes to teaching students this controversial subject matter,鈥� Mr. Mills says. 鈥淚 don鈥檛 understand, when it comes to the teaching of critical thinking in an academic environment, why censorship would ever be encouraged.鈥�

Critics say reframing teaching contrary to science as a censorship issue is intended to create a loophole for religious groups to get their agenda before students. Central to their concern is that the law does not require anything of teachers but it is written to embolden those who may feel tempted to voluntarily introduce theories that conflict with scientific teachings.

鈥淚t鈥檚 a tricky situation because the law is written in a way that it鈥檚 really hard to see a good path to a legal challenge. For a teacher who wants to teach creationism, it doesn鈥檛 stop them from doing it,鈥� says Josh Rosenau, programs and policy director of the National Center for Science Education, a not-for-profit group in Oakland, Calif., that is active in preserve the teaching of evolution in public school classrooms.

In its three years on the books, the law has never been challenged in court nor has it been the subject of public complaint, according to Ren茅 Greer, communications director with the Louisiana Department of Education, a result that Mills of the Louisiana Family Forum says affirms its credibility. 鈥淭here is no evidence this is a problem,鈥� he says.

Ms. Greer says any supplemental material introduced in science classrooms must 鈥渕eet the standards and policies of city and parish school boards.鈥�

However, it is unclear what, if any, procedures are in place for local administrators to approve the material a teacher may want to introduce to the official curriculum. Which creates the possibility that teachers could restructure the curriculum in any way they see fit and never get caught.

鈥淚f a teacher did it on their own, it might go on for years before we ever found out. It would take a very gutsy kid who was alert enough to go home and tell mom and dad,鈥� says Barbara Forrest, a spokeswoman with the Louisiana Coalition for Science, a citizens group mobilized three years ago to fight the law.

Ms. Forrest, who believes 鈥渢he law was passed to give cover to school boards and teachers who want to teach creationism,鈥� says whistleblowers may find it more onerous to challenge a certain teacher in smaller or more conservative communities where they could face criticism or even a loss of business revenue.