The Limits of Carbon 14 in Sewage

In the mid 1940s Willard Libby who was at Berkeley learned about these results that carbon 14 was surprisingly long-lasting and he thought hey that would be a really cool way to figure out how long something has been dead. The methane from the boston sewage system has a lot of carbon 14 and the methane from fossil fuels has none. I suspect it's just a question of like politics and access not every waste management system is interested in having scientists like dig around in their facility while others are you know free to share the science gold that is flowing through their pipes.