Had to call a sickie today due to my past injury with my back, couldn't reschedule any doctor online as it was last minute and those told me to come in as a walk through then refuses me, fair enough.
I asked for back dated for another days appointment and was told it's illegal, fair enough, then found online medical forums being done, took the bait $9 with product reviews and such and went ahead, now stumbling across some sites saying about doing back dating certificate.
Now the question is, are these illegal as GP clinics told me they were?
A stat dec is good enough evidence for sick leave according to the act. Keep the statement vague (don't go into detail) and get it signed at any number of places. You can also back date it by stating the period of time you were unwell for.