How did Inquisitors find Atium mistings?
They spike the drinks at one of the nobility’s balls with trace amounts of Atium, then cause a bit disturbance. (Often, the Inquisitors themselves arriving will do it) and burn bronze and watch for brief pulses. The body will burn metals instinctively if it can, which has been shown quite often in the series. This is also how they get a lot of their secret information about who is a Misting and who isn’t. It’s not a perfect method, since you have to watch for Copperclouds messing things up, but it is effective once in a while.
Any time an obligator who is not a Misting joins the Ministry, he is unknowingly given a larger chunk of atium and then forced into a series of rituals that will drain him physically and get the body to react and burn the metal. This was how Yomen was discovered.
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