Can demons spot telltales with the usual Lore roll?

If it's consistent with the concept for the setting that they can, then treat the demon as a sorcerer for Telltale-spotting purposes. [1]

For a sorcerer to spot another sorcerer's Telltale, roll Lore vs. Cover[2]; for a sorcerer to spot a demon's Telltale, roll Lore vs. 1 die (or versus Power, if the Demon has Cover conferred on itself).

2

Lore vs. Lore is also fine, depending on the setting.