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One school in Pennsylvania, apparently, requires that Intelligent Design be taught as an alternative theory. Most of the litigation mentioned in the U.S. media has to do with plaintiffs' insistence that Darwinism be taught as a hypothesis, not as established fact (see Berlinski's article above), and, most importantly, that the weaknesses of Darwinism be presented to students, not just its supposed strengths. There's no insistence, in these cases, that any alternative hypothesis be taught.
Additionally, I believe that the Pennsylvania case requires that ID be presented to students from the scientific writings of its proponents, such as the "irreducible complexity" arguments of biochemist Michael Behe. Students are not given a Bible in science class and told to accept Genesis as a "theory" of origins.
Unfortunately, students in other schools around the country are given "Origin of Species" and taught to accept it as established fact. The school in Pennsylvania is simply trying to cultivate critical thinking and an open mind.