Yes, SPOLIATION is a Scrabble word!

Letter values in Scrabble US: S 1, P 3, O 1, L 1, I 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

SPOLIATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(law) the intentional destruction of a document or an alteration of it that destroys its value as evidence
the act of stripping and taking by force

Not playable in Scrabble US: SPOILATION, DESPOILATION.