If you are asked whether or not you have been convicted of any crime, you can absolutely say "No." The purpose of the pretrial diversion program is to make sure that people who are in a situation like yours don't have a completely ruined future. Essentially, the purpose of PTI is so that first-time (one-time) offenders get the benefit of the doubt and get one free minor crime (depending on the crime).
Because your case is getting dismissed, I would say you probably do not need to disclose the case. However, if you are asked if you have ever been arrested for a crime, if you are honest about it, the answer would be "Yes." That being said, I would say that you do not affirmatively need to disclose the petit theft charge to your potential employer without being asked.
Good luck to you. You should not need a lawyer for this matter. If you have any legal issues in the Greater Tampa area, contact Greater Tampa Law, P.L. at 813-444-2244.
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Unless specifically asked I don't see a benefit to volunteering such information.
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It really depends on the employer. If you are legally able to say "no" because of a pretrial diversion you can certainly do that. I often advise clients to disclose because in the age of the internet, someone is likely to find out about it and ask you questions about it. If employers sense you are not being forthcoming, you could lose credibility. It's really a judgment call and depends on the job you're trying to get.