Reading through various books with an eye to how hermetic justice is despensed has lodged a question in the back of my mind. I was hoping that HoH:TL would resolve it in the Guernicus chapter, but the mystery was only deepened:
Quasitors are assigned to regional tribunals, where they are free to conduct investigations of possible violations of the code. If they find violations, they can prepare a case, publish it at least three months prior to the Tribunal, and then prosecute the case at the Tribunal...which happens once every seven years. And the defendant can simply not show up and instead be tried en absentia.
See the problems here? Its a system of justice where the detectives have no arrest powers and the courts only meet once every seven years.
If one is secretive in laying groundwork, one could be far along in some plot of high crime, dealing with devils, molesting the Fay, endangering the order, or whatever some villian can cook up, before they cross the line in an overt way that prompts discovery. If the Quasitor who discovered the violations of the Oath then had to wait 3 months - 7 years before they could present a case, a determined villian could do a lot of damage to the order.
By the time they were summoned to tribunal, they might have no further need for the Order, or be prepared to take it over, or have secretly corrupted it from within, or whatever. I know my PC's, they will exploit this in terrible ways.
Related question: I thought I read somewhere that quasitors are allowed to break the "no scrying" rule to gather evidence; if they can prove a charge they can't themselves be charged with scrying, but if they can't, they could themselves be accused of a hermetic crime. But now I can't find the reference.
NOTE: I realize that questions about the Oath, the Quasitors, and hermetic justice in general are very much YSMV. For those who prefer a toothless Order, this question obviously will not bother you. But I prefer a more active and structured order, and I've got a PC who was mentored by a demon, and has magic summoning/infernal commanding...so these things will matter.