A pre-trial release is generally going to be a release pending the disposition of a criminal case.
A suspended sentence is "probation".
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I am with Mr. Pierce-Jones. Pre-trial services monitor people who are on bond. People have received sentences are no longer on bond. I suppose it is possible he is on pre-trial release on a new case while serving a suspended sentence (probation) on another case. Or did he enter a pre-trial diversion program? Where any possible sentence is suspended unless and until he successfully completes the program. If he is unsure of the disposition of his case, he needs to contact the court immediately. Otherwise, I'm afraid he's headed for a warrant.
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Pre-Trial Services monitors someone who has a pending criminal case that has not been resolved yet. It's an alternative to a bond, or sometimes judges make it an additional requirement to a bond. A suspended sentence is probation which occurs after a criminal case has been resolved.