But, bear in mind, that if you are trying to demonstrate a proposition (for example 'it worked') it is not sufficient to collect evidence in support of that proposition. One must also facilitate disproof. Thus, to say 'there is no evidence that it did not work' would not in itself constitute a meaningful statement in support of the proposition 'it worked', in that the demand for evidential support, and the means to collect that evidence, are dependent on the successful 'working' of the very system the success of which the evidence is intended to confirm (or of course refute).
Alison
PS tee hee
PPS though obviously, people were warned, and will probably let Calle know if lysator suddenly disappears