Africanized bees owe their existence to science. Warwick E. Kerr created them in Brazil during the 1950s by crossing a European bee with an African bee. He wanted a bee that could live in the jungle. He got a bee that swarms by the hundreds of millions, is insanely territorial, mindlessly aggressive, has killed anywhere from a few dozen to a few thousand people.
There is no physical way to determine the difference between an Africanized bee and a common European bee. None whatsoever.
Hybridization does not always produce the convenient "better product" we hope for.