The phrase "questionable evidence" is correct and can be used in written English.
It is typically used to describe evidence or information that is uncertain or unreliable. Example: The prosecution's case relies heavily on questionable evidence, leaving room for doubt in the minds of the jurors.
Şirin's case wasn't the first to rely on questionable evidence.
The tape would be questionable evidence in court because Mr. Mery cannot be cross-examined.
It should abandon the current screening law, which can be easily used for political attacks based on questionable evidence.
The system allows prosecutors to hold people for long periods with little or questionable evidence, either deliberately or through ineptitude.
But, on the questionable evidence of an hour at the Groucho Club, he is far more accessible than his public persona suggests.
The government has fought back with a populist assault on Oxford and Cambridge based on questionable evidence that they practice class-conscious admissions policies.
The Free Anwar Now campaign released a statement ahead of the verdict saying the case had "been plagued with many anomalies and inconsistencies, questionable DNA evidence and tampering of critical evidence".
On Wednesday, lawyers for Edward Green, the next to face execution, filed for a postponement in state court on grounds that he was convicted on questionable firearms evidence from the laboratory.
After the broadcast of Sarah Koenig's podcast Serial, Adnan Syed – serving life for the 1999 murder of his 18-year-old ex-girlfriend Hae Min Lee – was granted a retrial, following questionable cellphone evidence in the initial case, in June.
In another case involving questionable scientific evidence, a Houston man who has served 17 years for rape was a big step closer to freedom Thursday after District Attorney Charles Rosenthal Jr. of Harris County said new tests showed that another suspect had been improperly ruled out by "unfounded and inaccurate testimony".
Worse, in a dealer system there is a risk of collusion among market-makers to keep spreads wide.The SEC has successfully pursued cases against Nasdaq dealers for collusion, partly on the basis of questionable academic evidence that purported to show that prices moved suspiciously more often in eighths than sixteenths.
