The person suspected of committing a crime is an identical twin. to determine which twin committed the crime, scientists would need to analyze their:

One set of identical twins, two different ancestry profiles. ... Despite having virtually identical DNA, the twins did not receive matching results from any of the companies. In most cases, the results from the same company traced each sister's ancestry to the same parts of the world — albeit by varying percentages.

Explanation:

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.