Once you successfully pass initial screening, your background investigator will send you a letter of instructions to schedule the exam. Each applicant is responsible for paying $49 to take the Frontline National Written Exam. Any MPD applicant who takes the FrontLine National Written Exam will receive total cost reimbursement within 30 days, if they are residents of the District of Columbia.
You can find a testing location near you here: https://nationaltestingnetwork.com/publicsafetyjobs/testing-locations.cfm
However, the first step in the application process is to complete an interest card at www.joinmpd.dc.gov.