Q's post checks out. It looks like a potential sponsor goes through an elaborate check before being approved.

Case managers are also required to:

• interview prospective sponsors;

• require prospective sponsors to complete an “Authorization for Release of Information;”

• conduct background checks on all prospective sponsors;

• coordinate fingerprint checks of the FBI database for non-parental sponsors, or for parental sponsors where there is a documented risk to the safety of the child, the child is especially vulnerable, or the case is being referred for a mandatory home study; and

• coordinate a check of the immigration Central Index System in some cases.

https://www.acf.hhs.gov/orr/about/ucs/sponsors