If you do not wish to sponsor a child that is using or has used drugs, I would advise against sponsoring a street child. Street children are at extreme risk. This decision would be made by the staff of support in their country. The child would also be afforded the services of medical personnel and Psychologist. It is far preferable to have a child re-integrated into their own family unit than living in a refuge or on the streets.
Girls are at higher risk.
They face the same rigors as the boys but are also at higher risk for rape, pregnancy, prostitution, and STD's. Many girls have been viciously beaten and some even killed for refusing to sell themselves. Sponsorship funds are audited each month and given to the respective organizations per their budget requirements. As the sponsorship program grows, then the moneys will be available to also build facilities or renovate existing structures. It will vary from program to program as to how the funds will be used.