Missouri's House Bill 486 (PDF) died in committee in the Missouri House of Representatives on May 15, 2015, when the legislature adjourned.
HB 486 purported to confer "academic freedom to teach scientific evidence regarding evolution" to teachers. If enacted, the bill would in effect have encouraged science teachers with idiosyncratic opinions to teach anything they pleased, while preventing responsible educational authorities from intervening. The bill specifically cited "the theory of biological and hypotheses of chemical evolution" as controversial.
HB 486 was referred to the House Committee on Elementary and Secondary Education, where it died without a hearing.