it says it isn't adequately funded to carry out the requirements of mckinney vento. congress will revis it mckenny vento funding this year. currently only 11% of schools win grants to implement the law. those 11% end up identifying half of all of the homeless students identified in public schools. very little funding is available for transportation costs . ian graduated recently from a first place school, celebrating a period of stability . but the lease on his family's subsidized apartment was over. later that day they were packing up to move and faced homelessness and new school challenges again. >> woodruff: now, another story about medicine, this of a shocking experiment and a tainted legacy. ray suarez gets the details. >> suarez: the medical experiments were conducted in guatemala more than six decades ago, but did not come to public light until this past weekend. between 1946 and 1948, researchers with the u.s. public health service deliberately infected nearly 700 guatemalans with syphilis-- most cases without their knowledge-- in an effort to determine whethe