f(4) However—
(a) property is excluded from the ambit of the presumption if it is established, on the
balance of probabilities, that it was acquired by the party more than 6 years before the
commission of the offence on which the proceedings under this Act are based; and
(b) the presumption may be rebutted, insofar as it relates to a particular item of property, by
establishing, on the balance of probabilities, that the property is not tainted