have not herd of any thing about people haveing problems with D.N.A. prouduct's but have had my own experiance working with them.Have worked on three grow's with their seed's LEMON SKUNK,SOUR CREAM AND L.A.CONFIDENTIAL.Both the Sour cream and the Lemon Skunk were sativa dominantand and did very good by me,but I was very disapointed with the L.A. Confidential an indica strain.It did not yield well but more importantly in didn't have the body or the head buzz I look for in a indica strain to help me relax and be able to sleep threw the night.How ever the sativa's that I worked with were very good if not great.