"dubious evidence" is correct and usable in written English.
You can use it to describe information or material that is questionable or unreliable. For example, "The prosecutor presented several pieces of dubious evidence in court."
What's more, it's based on highly dubious evidence.
After reviewing some dubious evidence, three years later the commission declared Doubleday the game's inventor.
Yet Blair accepted dubious evidence of them without question, ignoring contradictions and warnings.
Frank was convicted, on dubious evidence, of murdering a thirteen-year-old girl, Mary Phagan.
Now gun absolutists will argue – using dubious evidence - that the presence of more guns decreases crime.
Focus groups were revolted by "Dreams From My Real Father," with its conspiracy theory paranoia and dubious evidence.
Orlova's ideas were based on hearsay and dubious circumstantial evidence, but were accepted by Brown and a number of other authorities.
This has not, however, put an end to hopeful claims to have finally unearthed Shakespeare's "true" likeness, based on fairly dubious circumstantial evidence.
Over the years, violent crimes have been linked, with dubious supporting evidence, to heavy metal music, violent video games, anime and other pop culture ephemera.
Their case was incredibly weak, Bonner shows, resting on inference, some very dubious physical evidence and the testimony of a jailhouse snitch who claimed the defendant had confessed to him.
Miller takes her role as avenging angel utterly seriously, with the result that her thinking has ossified into an ideology consisting of a handful of reductionist premises, some dubious scientific evidence and any number of vague claims.
