Lawyers have the right to leave a firm and practice at another firm. Likewise, clients have the right to switch lawyers or law firms, subject to approval of a tribunal, when applicable (and conflicts of interest). The ethics rules do not allow non-competition clauses in partnership, member, shareholder, or employment agreements. Lawyers and law firm management have ethical obligations to assure the orderly transition of client matters when lawyers notify a firm they intend to move to a new firm.
An assistant state attorney in Monroe County (The Florida Keys) has just agreed to a plea in which she will use her law license for one year as a result of prosecutorial misconduct. According to the article in the Miami Herald (December 5, 2019), Colleen Dunne withheld evidence from defense attorneys as to three recorded phone calls between the defendant and his son. The case will also result in her termination from her job as an assistant state attorney. The plea and sanctions are still subject to review by the Florida Supreme Court.