Yeah, and not just that. The magical equivalents to forensic science would have to be terrible indeed if this works, with a lot of fail from intelligent people like Bones, Moody, or for that matter Snape.

I'm kinda hoping that what we're actually heading for in the next chapters will be some kind of payoff to this:

But there are a very few, seated on those wooden benches, who do not think like this.

There are a certain few of the Wizengamot who have read through half-disintegrated scrolls and listened to tales of things that happened to someone's brother's cousin, not for entertainment, but as part of a quest for power and truth. They have already marked the Night of Godric's Hollow, as reported by Albus Dumbledore, as an anomalous and potentially important event. They have wondered why it happened, if it did happen; or if not, why Dumbledore is lying.

And when an eleven-year-old boy rises up and says "Lucius Malfoy" in that cold adult voice, and goes on to speak words one simply would not expect to hear from a first-year in Hogwarts, they do not allow the fact to slip into the lawless blurs of legends and the premises of plays.

They mark it as a clue.

They add it to the list.

This list is beginning to look somewhat alarming.

PS. I wonder what an analytic charm cast on Harry's "bleeding" scar would show.

Last spell cast with Quirrell's wand was the acid for the plant.

They will have to find the wand first:

Voldemort's gun, and his wand, went into Harry's pouch. Harry placed the Stone of Permanency in an ordinary pocket, he wasn't sure what the Stone might do to his pouch.

Iff there is an investigation.

Given what we know about the wizarding world, I’m not so sure that there will be one.