airlocks must be opened for ingress egress......

and although operating rooms arent perfectly sterilized they are some
of the cleanest places in the hospital

And how exactly do they do that Bob? *Do you have a clue? *Now tell me why
none of that can't be done in an airlock?

Again, we don't have to be perfect, just 'good enough'

Greg D. Moore

since we have no idea what if any type of life may exist on mars we
dont know what we dont know..

so if a escaped earth organism replicates on mars we wouldnt know if
its from mars, or a earth transplant..

the discover of life on mars will be of cosmic importance.

once mars is contaminated theres no way to uncontaminate it.........

plus a existing mars organism might be wiped out by something from
earth.....

either of these situations should be avoided.....