dna evidence
someone i know was convicted and jailed for a crime commited 17 years ago,the only evidence was dna.the person has always maintained their innocence,the evidence was based on a 9 loci dna match.no fingerprints were found.since the conviction the persons family have all been dna tested at their own expence,also the convicted persons dna checked again by a forensic scientist,the scientist says on the report that the person convicted of the crime COULD have done it, surley that means they are not certain, what does that mean,surley you must be absoloutly certain,none of this was said in court,could anyone advise what the next step should be.thank you.