Taken from
http://www.afl.com.au/Portals/0/afl_doc ... t_2009.pdf
To qualify for the 25% reduction:
25% of the base points shall be deducted if the player has not
been found guilty of any reportable offence within the previous
five AFL years. If the player’s only reportable offence(s) in
the previous five AFL years have been financial sanctions, he
still qualifies for the 25 per cent deduction. If a player takes
an early guilty plea, the demerit points, including additions or
deductions, are subject to a 25% reduction.
To receive extra points for previous offences:
A player will receive a 10% loading for an offence for each match
that he has been suspended in the previous
three AFL years.
The maximum weighting a player can receive for offences in the
past three AFL years will be capped at 50%.
In my mind, if Gardiner has committed an offence either 4 or 5 years ago, this would rule him out of the early reduction, but at the same time not penalise him with extra loading.