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Ask them

Are you now, or have you ever been, a user of mind blank?

Interestingly, the spell zone of truth isn't divination - it's enchantment and doesn't seem to be affected by mind blank. This puts it an interesting position where it doesn't fall under the divination umbrella - and it also isn't giving information about the target. It is instead interpreting what they are saying: an external response analysis.

Once they're in the zone, ask them directly if they are under the effects of the spell mind blank. And yes, it's still possible for a sufficiently weaselly clever DM to come up with a non-lie response that doesn't say, but it's a pretty solid path to finding out.

This is a fairly straightforward and very unsubtle method, so it's actual effectiveness may be pretty limited.

Ask them

Are you now, or have you ever been, a user of mind blank?

Interestingly, the spell zone of truth isn't divination - it's enchantment and doesn't seem to be affected by mind blank. This puts it an interesting position where it doesn't fall under the divination umbrella - and it also isn't giving information about the target. It is instead interpreting what they are saying: an external response analysis.

Once they're in the zone, ask them directly if they are under the effects of the spell mind blank. And yes, it's still possible for a sufficiently weaselly clever DM to come up with a non-lie response that doesn't say, but it's a pretty solid path to finding out.

This is a fairly straightforward and very unsubtle method, so its actual effectiveness may be pretty limited.

Ask them.

Are you now, or have you ever been, a user of mind blank?

Interestingly, the spell zone of truth isn't divination - it's enchantment and doesn't seem to be affected by mind blank.

Once they're in the zone, ask them directly if they are under the effects of the spell mind blank. And yes, it's still possible for a sufficiently weaselly clever DM to come up with a non-lie response that doesn't say, but it's a pretty solid path to finding out.

This is a fairly straightforward and very unsubtle method, so it's actual effectiveness may be pretty limited.

Ask them

Are you now, or have you ever been, a user of mind blank?

Interestingly, the spell zone of truth isn't divination - it's enchantment and doesn't seem to be affected by mind blank. This puts it an interesting position where it doesn't fall under the divination umbrella - and it also isn't giving information about the target. It is instead interpreting what they are saying: an external response analysis.

Once they're in the zone, ask them directly if they are under the effects of the spell mind blank. And yes, it's still possible for a sufficiently weaselly clever DM to come up with a non-lie response that doesn't say, but it's a pretty solid path to finding out.

This is a fairly straightforward and very unsubtle method, so it's actual effectiveness may be pretty limited.

Ask them

"Are you now, or have you ever been, a user of mind blank?

Interestingly, the spell zone of truth isn't divination - it's enchantment and doesn't seem to be affected by mind blank.

Once they're in the zone, ask them directly if they are under the effects of the spell mind blank. And yes, it's still possibly for a sufficiently weaselly clever DM to come up with a non-lie response that doesn't say, it's a pretty solid path to finding out.

This is a fairly straightforward and very unsubtle method, so it's actual effectiveness may be pretty limited.

Ask them.

Are you now, or have you ever been, a user of mind blank?

Interestingly, the spell zone of truth isn't divination - it's enchantment and doesn't seem to be affected by mind blank.

Once they're in the zone, ask them directly if they are under the effects of the spell mind blank. And yes, it's still possible for a sufficiently weaselly clever DM to come up with a non-lie response that doesn't say, but it's a pretty solid path to finding out.

This is a fairly straightforward and very unsubtle method, so it's actual effectiveness may be pretty limited.