The phrase "first-hand evidence" is correct and usable in written English.
It can be used when referring to information or proof that is obtained directly from personal experience or observation.
Example: "The researcher presented first-hand evidence of the effects of climate change based on her field studies."
Alternatives: "direct evidence" or "primary evidence."
The only piece of first-hand evidence available reports that the mask was of black velvet.
There is no real first-hand evidence of what he stands for.
Over the previous few days we have seen first-hand evidence of this urgency on the trail to Tsetseng.
There would be witness accounts, friends and family providing first-hand evidence, phone pictures, soundbites, reactions that informed the narrative.
But glance down at his index finger, which sports a scorpion tattoo, for first-hand evidence of his unconventional streak.
Why should it just be painters who are sent to war zones to collect first-hand evidence for subsequent work?
It is interesting to note that those who purport to give first hand evidence in support of the allegations are at the lower end of the scale, being drug users or trafficking in them.
As a mature student, this is first hand evidence that you don't necessarily need to take the conventional A-level route in order to gain entrance for this programme.
The two best seem to be that recorded evidence is somehow always more powerful than reported or second-hand evidence, however reliable the reported evidence may obviously be.
You know she exists the same way that you know Uruguay and the Aleutian Islands exist; through thousands of fragments of third- and fourth- and fifth-hand evidence over the years, each of which individually has some weight, but, more importantly, collectively knit together into a coherent, consistent narrative that feels like the fabric of reality itself.
This finding might provide second-hand evidence for SCM that corresponds to the original preventive intention.
