UNFPA provided aid to Peru's reproductive health program in the mid-to-late '90s. When it was discovered a Peruvian program had been engaged in carrying out coercive sterilizations, UNFPA called for reforms and protocols to protect the rights of women seeking assistance. UNFPA was not involved in the scandal, but continued work with the country after the abuses had become public to help end the abuses and reform laws and practices. 

During what period did UNFPA aid Peru's reproductive health program?