There is no way for a doctor to know from a bullet wound that someone got "sniped". All bullets lodged in the body look the same, whether they just happened to run in the path of fire, or if a a sniper targeted them on purpose.This just doesn't make any sense.
On one hand, it's trivially correct in that no forensic information can ever tell us anything about the intent of the person who fired the bullet.
But otherwise, what you're saying just doesn't hold up to basic common sense. First, "All bullets lodged in the body" definitely do not look "the same" -- some are fragmented or marked in ways that otherwise show signs of having passed through something besides human flesh (more suggestive of an indirect hit) while others are not (suggesting a direct hit).
The circumstances of the entrance would can also say something about the bullet's approximate velocity when it entered the body, and direction of fire. Finally, the location of the wound is itself very important - a disproportionate number of people with gunshot wounds to the head tends to suggest that, well, that's where whoever was firing at them was aiming at.
Such indications may not be sufficient to determine conclusively that someone was sniped. But they do shift the overall balance of evidence, and require us to weight our probabilties for any such interpretations of what happened accordingly (in the context of other available evidence, of course).
It isn't as if the condition of the bullet and the circumstances of the wound provide no signal at all in this regard, as you're suggesting.