That would never happen in a parapsychology test as it is full of obvious sensory leakage problems.To have a comparable situation to most drug trials, the outcome would have to have a subjective component. Thus for example if the parapsychologist were to try to influence an observers interpretation of an undefined shape, and one was then to assess by closeness to the intended interpretation or some other non binary outcome whether the intervention was better than a placebo intervention.
I disagree. If a psychologist did an experiment and the result was statistically significant, few other scientists would question it. They might try to replicate it but using the same experimental design. By contrast, if a parapsychologist got a similar significant result, there would be scientists crawling all over the design criticising it. I have no problem with this but it does mean that parapsychologists need to demonstrate a higher level of experimental controls than in comparable, uncontroversial fields.The first situation is one where rigour is possible and insisted upon in any field, parapsychology is no different to any other scientific field provided one only considers the lab condition experiments.
Firstly, amateur scientists DO contribute usefully to hard science. Until recently, astronomers relied on amateurs to spot novae, comets, new spots on gas giants and so on. Amateur naturalists contribute hugely to natural history, reporting unusual animal behaviour, changes in species distribution and so on. Their results are not generally challenged. Amateur science is alive and well and valued (and I think some amateurs are better than certain professionals, having read their papers!).Where it falls down is by incorporating data from uncontrolled experiments to support its case. This would be a bit like physicists having Cern at one end and guys in a shed at the other end both contributing to our theory of the universe.
Secondly, nobody equates strictly controlled lab parapsychology with ghost hunting! That may be the impression those outside the field might form but it is wrong. When parapsychologists talk science, they don't invoke poltergeists, just lab studies.