Trigger words: marginal humans (2)
Indicator sentences: I am not sure what you mean by marginal humans. Are you referring to those with mental deficiencies? Severe brain damage?
Negotiation parts: Marginal humans are those who have a quality of life lower than normal humans and similar to that of animals. For more see [Vivisection, morals and medicine](http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1059351/)