From Wikipedia:
Bologna, March 2011 tests
On March 29, 2011 two Swedish physicists, Hanno Essen, associate professor of theoretical physics and a lecturer at the Swedish Royal Institute of Technology, and former chairman of the Swedish Skeptics Society, and Sven Kullander, Professor Emeritus at Uppsalla University and also chairman of the Royal Swedish Acadamy of Sciences’ Energy Committee, participated as observers in a test of a smaller version of the Energy Catalyzer. The test ran for six hours and the calculated energy produced was about 25 kWh.
In their report they write, “Any chemical process should be ruled out for producing 25 kWh from whatever is in a 50 cubic centimeter container. The only alternative explanation is that there is some kind of a nuclear process that gives rise to the measured energy production.”
According to Mats Lewan of the Swedish technology magazine, Ny Teknik, they were given a sample of the nickel powder used in the unit as well as some Rossi says have been used for 2.5 months; analysis showed the unused powder was pure nickel while the used powder contained 10 percent copper and 11 percent iron, although iron production is not mentioned anywhere in the patent.
They prefaced their discussion in the report with a disclaimer: “Since we do not have access to the internal design of the central fuel container and no information on the external lead shielding and the cooling water system we can only make very general comments.”
I've not seen any smoking gun or explanation of how they could be faking things with the E-cat demonstrations, but it is not impossible that it is a well-planned scam either. So I'm hopeful, but still waiting for the demonstration reactor in Greece or for fully independent lab verification (or a teardown of a unit after seeing it function), to really jump on the bandwagon.