who have experienced an overdose, or are at risk of developing substance use disorder, the provision of referrals to facilitate the access of such individuals to core medical services or recovery and support services for substance use disorder, and rapid access to medication-assisted treatment in the setting of recent overdose. The entities through which such services may be provided include emergency rooms, fire departments and emergency medical services, detention facilities, prisons and jails homeless shelters, law enforcement agencies, health care points of entry specified by eligible local areas, federally qualified health centers, tribal clinics and hospitals, urban Indian health facilities, and rural health clinics. (f) Harm reduction services For purposes of this section, the term harm reduction services means evidence-based services provided to individuals engaging in substance use that reduce the risk of infectious disease transmission, overdose, or death, including by increasing access to health care, housing, and recovery and support services. (g) Administration and planning An entity (not including tribal entities) shall not use in excess of 10 percent of amounts received under a grant under section 3421 for administration, accounting, reporting, and program oversight functions, including for the purposes of developing systems to improve data collection and data sharing. 3423. Technical assistance The Secretary may, directly or through grants or contracts, provide technical assistance to nonprofit private entities and Indian entities regarding the process of submitting to the Secretary applications for grants under section 3421, and may provide technical assistance with respect to the planning, development, and operation of any program or service carried out pursuant to such section. 3424. Planning and development grants (a) In general The Secretary may provide planning grants to public, nonprofit private, and Indian entities for purposes of assisting such entities in expanding their capacity to