When ever photo copies are any documents are given, it is proper to mention the purpose of giving it, to whom it was submitted and when it was submitted on each page with full signature so that it can not be misused. These details to be incorporated at a place where deleting or applying white liquid/erasing fluid can not be applied.
The owner may not be knowing as to Who misused, when it was misused , unless he writes the particulars.
One can not doubt all the time, and because it was given to a professional, at this point of time, there may not be any danger. But to avoid such risks, atleat in future, or now it is better to incorporate the facts.
Many citizens have even prepared a rubber stamp in the following manner and using it when providing any copy including AADHAR and Voter card.
This Xerox copy given for the purpose of...................to .......................on............................
......................................................Taken xerox copy as mention above.
(Who gives).................................... Who takes ................................