Since Pittsburgh banned fracking in 2010, more than 100 municipalities have introduced their own ordinances to limit or completely prohibit oil and gas extraction, pipelines, or waste injection wells. http://powersource.post-gazette.com/powersource/policy-powersource/2016/10/04/Oil-and-gas-industry-group-ponders-criminal-prosecution-of-local-officials/stories/201610040004