Conspirationalist
A person with the ability to use critical thinking skills and/or factual sound evidence and apply them to what may be considered conspiracy theories in order to test said theories.
I'm not going to discredit something purely on the basis of it being called 'conspiracy theory'. Scientific 'theory' is also just 'theory' and theory can largely be credited or discredited by facts and evidence. I look for those facts so I'm a conspirationalist.