Where the record comes from
Your record is held in the casellario, the register kept at the court, and the sheet you receive is a print of what stands there today. An apostille is a single certificate that proves the seal and signature on that sheet are real. So how to apostille a Criminal Record Check is a short story: get the sheet, then have the court stamp it.
Because a court issues it, the sheet is a judicial paper. That is why you apostille a Criminal Record Check in Italy at the Procura della Repubblica of the court whose district issued it. The prefecture counter, which handles town hall papers, cannot help.
One building, two counters
This is the rare case where both halves of the errand live at one address. To apostille a Criminal Record Check in Bari, you queue once for the sheet at the casellario counter and once more for the stamp at the Procura. Bring identity papers to the first counter and the printed sheet to the second, and check the opening hours of each before you set out.
Cost and timing
The apostille cost for a Criminal Record Check in Bari is the same public charge as for other papers: a €16 tax stamp per document, with some uses exempt. The court also asks its own duty for printing the sheet. Neither payment speeds anything up, and the wait at the counter depends on the day, so treat any promised date as a guess.
Who asks for it
Employers abroad ask for it before a work permit is granted. Licensing bodies ask before they let a nurse, a teacher or a driver work. Adoption panels, residence offices and some universities ask as well, and each one words the request in its own way.
You may be asked for the legalisation of a Criminal Record Check in Bari, an older name for the same job. Italy has been a Hague Convention state since 1978, so member countries take the single stamp with nothing added. For a destination outside that circle, put the question to the office that will read the sheet.
Translation, and what the sheet does not say
A sworn translation is usual, made by a translator who signs an asseverazione, a formal statement of accuracy, before an Italian court. Ask whether the stamp itself must be rendered too. Remember also what the sheet cannot do: it reports the Italian register on one day, so nobody should read it as a promise about any other country or any later date.