 [ Symptoms ] is it healthy to breastfeed a four year old  my daughter in law is still breastfeeding her four year old at night is this healthy [ Disease ] i do not believe your cocaine use six weeks ago will show up on your drug screen assuming the screening test is with urine or blood samples in most cases cocaine will all dissipate in 2 5 days depending on the amount that you used however our hair can hold detectable evidence of cocaine use for about three months