Implicit detection magic

[zot]

Only magic that explicitly allows it should be capable of divination, like the Trance spell, wishes, and crystal balls.

There are several spells which can be used for types of detection, however, and I think that should be allowed, within reason (which is determined by the GM), they just shouldn't be capable of divination (answering questions about the future, etc.). I think even some computation should be allowed, although a pass/fail exam grading gate does sound unreasonable...

Here's what I think is a reasonable limitation: magic rules should be based on currently potentially observable properties of a subject (even observable through telepathy). I think it fits the "king of a far-away city sneezed" example in Expunge. "Currently observable" should be limited to the last couple minutes or so. Thoughts, missions, intentions, etc. would be OK but sifting through memories would not (even though memories themselves are current properties).

These are the spells I've found, so far, that can be used for detection but are not specifically "detection spells":

Calling
Limiting Spell
Expunge
Blast Trap
Gate
Control Gate (temporary gate rules are cheap)
Proxy