(1) Whether the National Treasury makes use of private security firms; if so, how much money was spent on such firms in 2008; (2) whether these firms are used on a contractual basis; if so, (a) how many contracts did National Treasury take out in this regard in 2008, (b) with which firms were these contracts taken out, (c) for what specific purpose was each contract taken out and (d) what was the value of the contract in each case; (3) why is private security firms used as opposed to state security?