Can a practicing Catholic officiate at a civil wedding?

The conditions

A Catholic may preside at a civil wedding if:

• the couple are non-Catholics who are not bound by Catholic marriage law;
• there are no obvious impediments to the marriage, such as a prior marriage or close blood relationship;
• the Catholic is authorized by the state to perform civil weddings — for example as a judge or justice of the peace.

One caveat

A Catholic may not obtain an "ordination" from a mail-order or online ordination mill, even if the state recognizes weddings performed by people ordained that way.