Nothing prohibits him from talking to the witnesses. However, they are not compelled to talk with him unless he subpoenas them to a deposition.
You should not advise the witnesses to not speak with the other lawyer. Be careful regarding your discussions with the witnesses. Remember that "tampering with the witness" is a crime.
You are not required to disclose any contact or conscious conversations you have with your witnesses. However, either you or the witnesses could be asked those questions during deposition or trial and answers could be compelled.
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An attorney is free to contact non-party fact witnesses. There is no requirement for subpoena or deposition.
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If the witnesses are reliable and trustworthy, to your knowledge and you have not coerced them, scripted them nor paid them anything, they should have no problem talking to the other side's lawyer and the lawyer has the right to contact them to find out what they know and will say on your behalf. They have the choice to talk to your opponent or not. For either side to record sworn testimony prior to trial the witnesses should be subpoenaed and deposed. For unsworn testimony a recorded statement or sign written statement can be given but only if the witness consents. In other words, if your witnesses don't want to talk to your opponent, they don't have to unless subpoenaed. I'm confident this is the procedure in Florida as well as my state. If you want everything to be done correctly, it is always best not to represent yourself, even if you were a lawyer. You know the saying: A lawyer representing himself has a fool for a client.
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