Ritual/site searching questions

[Agrajag]

Wick said:
It also doesn't factor that existing searches in other paths improve the odds because I've forgotten the proof that it does.

If I understand what you mean, then the proof is as follows:
A province has a certain number of magic sites, for example lets say a certain province has 1 magic site.
If you searched the province for every magic other than death, and didn't find anything, then that means that the site must be a death site, so the province having been searched for other magics without finding any sites means it is more likely that what sites are in the province will be of the path you are now searching for.