There were usually only two possibilities for such a situation.
Firstly, corrupt personnel had appeared in the Pan-Plane Wizard Council, which sheltered many illegal organizations like Whale Song Island. As a result, many wizard organizations obeyed the law on the surface but did some shameful things in secret.
At the very least, there must be some shady dealings in the Star Tower, the management organization of the Realm of Azure Cloud.
Perhaps the Star Tower's law enforcer had already been bribed by some dark wizard organization. Otherwise, it would be very difficult for Green Ghost Carter to sneak into the Shadow Realm under the witness of a Second-Circle Wizard.