Banking sources said some transactions raised sufficient concern to trigger an internal investigation into potential money laundering activities.
More than 33,000 people died from opioids, which include prescription painkillers and heroin, in 2015. The CDC calls it an overdose epidemic.
The signature comes nine months after voters in Britain decided to leave the European Union. The process could take up to two years.
'We look forward to showing the entire world what is on our yet-unreleased video tapes,' the Center for Medical Progress responded in a statement.
The FDA approved a new, injectable drug on Tuesday to treat serious cases of eczema.