Politicians on drugs?

I was watching Question time in the Australian Parliament just after the budget release. There was on the benches one politician sitting there stone faced and the question is this. Are Politicians aloud in the Parliament on drugs or was the politician pumped up with Botox or Bata blockers?
If you really are petrified about giving or having to answer a question taking a Beta-blocker (which is commonly used by singers  musicians and psychiatrists before performing). This blocks the adrenaline rush and will keep your voice steady.  
The second question is do they use these in our Parliament and is it legal to go into a court room plastered with drugs.