In a new study , researchers instructed a group of children , including two sets of identical twins and two sets of fraternal twins , to swab the insides of their cheeks and place the swabs in glass jars .
All three denied involvement , but the two dna examiners in the original case both found that they could not exclude one of the three from having been involved , based on an analysis of swabs taken from the victim .
Emergency maternity care is supposed to be free in sierra leone , but in reality , patients are asked to pay for every item , including cotton swabs , gauze and syringes -- this in a country where the average income is about $ 200 a year .