paternity test gone wrong..

our daughter is a year old and my husband asked for a paternity test..so he went to have this done..The test results came back 0% ..I asked him that's impossible our daughter looks like his other kids from his pprevious marriage..I'm so hurt..I've been crying all day.. He told me I don't want to justify anything.. but I had a wad of chew in my mouth spit it out then took a drink of water before the lady swabbed my mouth..I couldn't believe it my mouth dropped..I called the lab and told them. I can't believe this..I know for 100% that my daughter his his..