In November 2017 the U.S. Department of Health and Human Services released foster care data showing an increase in the number of children in foster care for the fourth year in a row. State government agencies report data to HHS for this report. Of the categories states report on, drug abuse by a parent had the largest percentage point increase as the reason for the child entering foster care. Approximately 92,000 children were removed form their home in FY 2016 because at least one parent had a drug abuse issue.
See the full report here.