When a plaintiff requests that a court order a defendant to undergo a psychological examination to determine capacity and competence, the question of who pays for this examination can vary depending on the jurisdiction and the specific circumstances of the case. Generally, there are a few possible scenarios:

  1. Plaintiff Pays: In some cases, if the plaintiff is the one requesting the examination, they may be required to bear the cost. This is especially common if the examination is deemed to be primarily for the benefit of the plaintiff’s case.
  2. Defendant Pays: In other instances, particularly if the examination is deemed necessary for the defense or is ordered by the court without specific request from the plaintiff, the defendant might be required to pay for it.
  3. Court Pays: In certain jurisdictions, the court might cover the cost of the examination, especially if it is deemed essential for a fair trial or if neither party can afford the examination.
  4. Shared Costs: Sometimes, the costs might be divided between the parties, depending on the court’s decision and the nature of the case.
  5. Insurance or Public Funds: If relevant, insurance or public funds might be used to cover the costs, especially in cases involving mental health issues or criminal matters.

It’s important to note that the specific rules can vary widely. In many legal systems, the judge has discretion in deciding who should bear the cost, based on factors like the necessity of the examination, the financial status of the parties, and the nature of the legal dispute.

For a definitive answer, one should consult a legal expert familiar with the laws and court procedures in the relevant jurisdiction.