Can they test for drugs in cord blood?

Yes, and so can your urine and blood. Not only that but when your baby is born the staff do not need your permission to drug test your baby (by any means, urine or blood). If you use any drugs while pregnant it will show up in your baby's system. Why are you doing drugs when your pregnant? I am 6 months pregnant and I gave up drinking alcohol, smoking cigarettes, and smoking pot when I found out. Please, don't be selfish, this is 9 months of your life. Give it up and get help if necessary. Do some research about what a mothers drug use does her developing baby.