Mr Darg was injured checking an air bag when a hidden knife, wedged between two front seats, sliced into two fingers.
As a consequence, Mr Darg has been unable to work since the accident at east London's Limehouse police station in September 2002.
The court was told Mr Darg is considered to be one of the finest shots at the rifle club near his home in Vigo, Kent.
And he added that while Mr Darg had made "a better recovery than either he or his wife describes" he had a "genuine disability with unpredictable symptoms which can flare up at any time.
Mr Darg, of Vigo, Kent, has been unable to work since the accident at East London's Limehouse police station.
Mr Darg said afterwards: "I'm pleased with the victory.
It showed the court secretly-shot film of Mr Darg
shopping in a DIY store and firing his air rifle at a competition.
MUTUAL TRUST: Amanda and Alex Darg
started with separate accounts but now pool all their money Pictures: SHANNON MORRIS, SAM BARCROFT and ARNOLD SLATER
ALBION: Daniels' Hodgkiss, Kelleher, Pringle, Darg
, Forsyth, Smikle, Davies, S Nicholson, Earnshaw, Dyer.
ALBION (4-4-2): Hoult Darg
, Hodgkiss, Baker, Dyer Smikle, Davies, Pringle, Humphrey (McGovern 58) Elvins, S Nicholson (D Nicholson 81).
ALBION: Kirkland, Darg
(Baker 81), Hodgkiss, Davies, Moore, Gaardsoe (Forsyth 90), S.