Whether the police made use of private landing strips along the northern borders of South Africa in order to facilitate effective patrolling of the borders; if not, why not; if so, (a) how many such private landing strips were in existence, (b) how were such strips available, (c) which borders were patrolled this way, (d) how were they (i) resourced and (ii) maintained and (e) how were they (i) monitored and (ii) safeguarded?