Btw, what does single cell matter
We can't do a DNA test on a zygote because the DNA is destroyed when tested, so we wait until it has divided and there are 16 cells, and then do a DNA test on one of them. The problem then is that CRISPR-Cas9 wasn't all that accurate, so trying to gene edit 15 cells results in an embryo that is a chimera, with not all cells being the same. Recent innovations means CRISPR-Cas9-HF1 is 99.9% accurate, but that still means 0.1% of attempted changes will fail to be changed successfully. One in one thousand doesn't sound like a lot but that means that one in 67 embryos to be single-gene edited will be a chimera, which could result in autoimmune issues depending on the target gene.
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.
http://en.wikipedia.org/wiki/Extradition_law_in_the_United_States#Countries_with_diplomatic_relations_but_no_extradition_treaty
I like work; it fascinates me; I can sit and look at it for hours.