Garda Keith Harrison and his partner Marisa Simms have been refused most of their costs for their appearances at the Disclosures Tribunal.
It described Mr Harrison's claims that he faced a hostile reception and was discriminated against in Donegal Garda Station as "nonsense" and his evidence in connection with texts on his partner Marissa Simms phone as "ridiculous" and "nonsense".
It also ruled there was "no basis for finding as true" his most damaging allegations against the gardaí generally, the social work system and individual members of both organisations.
In rejecting Mr Harrison's claims of a conspiracy, Mr Justice Peter Charleton said that "were there any truth to those allegations, it would be a national scandal of resounding proportions".
The tribunal also found that Ms Simms made "false" allegations against a garda inspector and a garda sergeant.
Mr Justice Charleton also said it was very difficult to justify the award of any costs to Ms Simms.
He said: "Perhaps the best that might be said is that out of loyalty, and in the emotional circumstance fully detailed in the tribunal report, she went along with the account of her domestic partner Garda Keith Harrison."
The Supreme Court judge allowed Mr Harrison and Ms Simms' their costs for preparation and the first day of the tribunal, but stated for both that "as of day 2 on; no costs".
Both now face substantial legal costs.