"The differences between the 2011 and 2012 eDNA testing results may be partly attributable to the evolving technology, " said Peter Sorensen, director of the Minnesota Aquatic Invasive Species Research Center and leader of the research team.

WSJ: Study finds Asian carp numbers low in Minnesota

Prof John Pickett, leader of the research team, defended the experiment and says that they are dedicated in finding new ways to "protect our crops".

BBC: GM researcher: 'Please don't destroy our crop'

He is the leader of a research team - comprising 20 scientists, doctors and specialists - which has been working on the project since 1999.

BBC: Mother-to-daughter womb transplant 'success' in Sweden

The woman who received the first-ever near-total face transplant in the United States told her doctor she has regained her self-confidence, said Dr. Maria Siemionow, head of plastic surgery research at the Cleveland Clinic and leader of the transplant team.

CNN: The story