Does the local police force working under the direction and supervision of a foreign govt count as a 'procedural error' as well?
Just in the case that you're actually interested in the response, it's going to disappoint you : no. Imagine if that were true : you'd just have to cross a single jurisdiction line and you'd get away with any crime whatsoever. That doesn't quite work.
Ah, but it does work! Ever heard of non-extradition countries? There are quite a few of them:
Afghanistan, Algeria, Andorra, Angola, Armenia, Bahrain, Bangladesh, Belarus, Bosnia and Herzegovina, Brunei, Burkina Faso, Burma, Burundi, Cambodia, Cameroon, Cape Verde, the Central African Republic, Chad, China, Comoros, Congo (Kinshasa), Congo (Brazzaville), Djibouti, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Guinea, Guinea-Bissau, Indonesia, Ivory Coast, Kazakhstan, Kosovo, Kuwait, Laos, Lebanon, Libya, Macedonia, Madagascar, Maldives, Mali, Marshall Islands, Mauritania, Micronesia, Moldova, Mongolia, Montenegro, Morocco, Mozambique, Namibia, Nepal, Niger, Oman, Qatar, Russia, Rwanda, Samoa, São Tomé & Príncipe, Saudi Arabia, Senegal, Serbia, Slovenia, Somalia, Sudan, Syria, Togo, Tunisia, Uganda, Ukraine, United Arab Emirates, Uzbekistan, Vanuatu, Vatican, and Vietnam. Also note that Taiwan is one for now but the US is currently talking to them about it.
Beware of all enterprises that require new clothes, and not rather a new wearer of clothes. -- Henry David Thoreau