I need to add that a calibration run with an electrical heater supplying all the heat also provides very valuable information about the heat capacity and time constant of the system. And finally, if hydrogen (but nothing else) is omitted for the blank run, any chemical reaction or other subterfuge which is activated by heating would be revealed.
Of course other ways of cheating are not totally excluded but proper blank and calibration runs would go a long ways to inconveniencing a potential scammer to the extreme if astute observers were standing by.
