the script was the one given to Roddenberry, but was unable to do anything about it. After a series of leaks at Tesla Motors in 2008, CEO Elon Musk reportedly sent slightly different versions of an e-mail to each employee in an attempt to reveal potential leakers. The e-mail was disguised as a request to employees to sign a new non-disclosure agreement. The plan was undermined when the company's general counsel forwarded his own unique version of the e-mail with the attached agreement. As a result, Musk's scheme was realized by employees who now had a safe copy to leak. In October 2019, British celebrity Coleen Rooney used the technique to identify who was leaking information from her private Instagram stories to tabloid newspaper The Sun by posting fake stories which were blocked to all but one account. When these details appeared in the press, she publicly identified the leaks as coming from the account of Rebekah Vardy, wife of footballer Jamie Vardy. The subsequent libel trial became known as the Wagatha Christie case. In December 2020, Andrew Lewer, a Member of Parliament and Parliamentary Private Secretary in the UK government, was fired after a canary trap in the form of a letter reminding staff not to leak was published on the website Guido Fawkes. Barium meal test According to the book Spycatcher by Peter Wright (published in 1987), the technique is standard practice that has been used by MI5 (and other intelligence agencies) for many years, under the name "barium meal test". A barium meal test is more sophisticated than a canary trap because it is flexible and may take many different forms. However, the basic premise is to reveal a supposed secret to a suspected enemy (but nobody else) then monitor whether there is evidence of the fake information being utilised by the other side. For example, a suspected double agent could be offered some tempting "bait": e.g., be told that important information was stored at a dead drop site. The fake dead drop site could then be periodically checked for signs of disturbance. If the site showed signs of being disturbed (for instance, in order to copy microfilm stored there), then this would confirm that the suspected enemy really was an enemy, i.e., a double agent. Embedding information The technique of embedding significant information in a hidden form in a medium has been used in many ways,