The phrase "probable causes" refers to reasons or evidence that make something likely to happen or be true. It means there is a good chance or a strong possibility that certain factors or events will result in a particular outcome. Full definition
If investigators find probable cause of discrimination they would schedule a hearing, officials said. (dnainfo.com)
Even the article itself still confirms that the standard for probable cause for an actual search is still greater than for mere traffic stop alone. (law.stackexchange.com)
If the county board of elections finds probable cause for a challenge during the preliminary hearing, they are required to schedule a hearing on the challenge itself. (politics.stackexchange.com)