Abstract :
The phenomenon of natural transport of material from the surface of Mars to the surface of planet Earth, in the form of martian meteorites, cannot be used as justification to relax or abolish plans and procedures for quarantine and strict sample containment for future Mars sample return missions (MSR). Biosphere upsets, ecological disasters, and species extinctions have been far too numerous and their causes too poorly understood to rule out occasional possible contributions from exogenous biological invaders. In addition, in todayʹs large, highly intertwined global civilizations, even small perturbations to public health, ecological stability, economic balances, or perceived threat of any of these could eclipse the public support that will be needed for space exploration and sample return programs with responsible planetary protection measures.
