Stowaway
A stowaway was an individual who gained entry to a starship without permission.

When Captain Jonathan Archer told Matthew Ryan about the Nausicaan bio-signs T'Pol picked up aboard the , Ryan considered a stowaway aboard his freighter but was read by Archer who told him not to tell the truth. ()

In 2270, Commander Demos was considered a stowaway aboard the . After the accusations about Leonard McCoy were cleared up, James T. Kirk promised to forget about Demos' intrusion. ()

In 2369, Jadzia Dax compared the possible presence of Rao Vantika in Ty Kajada's mind to that of a stowaway. ()

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Illegal occupations