sentences:  The realization that biological weapons may become the poor man's atom bomb also contributed to the end of the U.S. biological weapons program.Subsequently, President Nixon announced that the U.S. was unilaterally renouncing its biological warfare program, ultimately signing the Biological and Toxin Weapons Convention in 1972.President Richard M. Nixon issued his "Statement on Chemical and Biological Defense Policies and Programs" on November 25, 1969 in a speech from Fort Detrick.