Yes, DRUSES is a Scrabble word!

Letter values in Scrabble US: D 2, R 1, U 1, S 1, E 1, S 1.

Is it a valid word?

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

an adherent of an esoteric monotheistic religious sect living in the relative security of the mountains of Syria and Lebanon who believes that Al-hakim was an incarnation of God

Not playable in Scrabble US: DRUZE.