Her flat, gold eyes peer at us from beneath a plaid veil as she tells her story???I used to weave carpets and also worked as a maid,??? she says. ???Then my husband got cancer and died.???Zahra???s life spiraled downward, hitting bottom when her sister-in-law, returned from Iran and offered her heroin.Now, Zahra says, ???I can???t do anything except beg on the street.???We pull back a red cloth to