I certainly think that in some cases that would be true. In other cases, there might have been an agreement that was a condition of his release. It will depend on each case.
On May 2nd, 2017. See this statement in context.
On May 2nd, 2017. See this statement in context.
Ambassador of Canada to the People's Republic of China, Department of Foreign Affairs, Trade and Development
I certainly think that in some cases that would be true. In other cases, there might have been an agreement that was a condition of his release. It will depend on each case.
See context to find out what was said next.