One is generally subject to extradition if they are charged with an offense covered by an extradition treaty (there are often procedural details here, but IIRC they generally don't extend much beyond verifying that there is a minimally plausible basis for the charges, similar to a preliminary hearing.)

Guilt or innocence is determined at trial after extradition; guilt isn't a question to be resolved to determine whether one is a subject to extradition.