Normally attorney may only represent clients in the states where they are licensed and, attorneys who are licensed by a state normally also have to pass a kind of "mini" bar exam in order to be able to appear in federal court after they pass their state's bar exam and are licensed by thier state. HOWEVER, an attorney licensed in one state (such as WA) may be able to appear in another state where they are not licensed (such as NY, CA, or AZ) IF they properly follows the laws of the state where they are not licensed to appear "pro hac vice," which normally requires them to obtain the assistance of an attorney licensed in the "new" state to also work with them (as may be requried by a state's "pro hac vice" laws or regulations).
More information about pro hac vice rules in AZ can be found here, and also here or here
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