Hi,
If you at all unsure it can't hurt to email the consulate for clarification:
consularsanjose@state.gov or call NVC at 603-334-0700 then press 1 then 5 to speak with an operator.
The consulate specific information can be found here:
linkFor Costa Rica the following information is given:
Instructions for Immigrant Visa Applicants
San Jose, Costa Rica
Police certificatesCosta Rican police certificates may be obtained only through an official request. Instructions and the required letter of request are available from the Embassy’s Consular section.
This document should be requested only when you have received notice from the National Visa Center that we have completed all processing, as police certificates are only valid for a specific amount of time (30 days). You will receive further instructions including your interview date and time and how to request the police certificate from your Embassy.
linkThe reciprocity information states:
linkPolice RecordsCosta Rican police certificates may be obtained only through an official request. Instructions and the required letter of request are available from the Embassy's consular section.