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It would be unprofessional to release information about finished jobs, it could be embarrassing for the client who payed for the job.
But how do we know killer would get things done correctly? It`s not like buying soda, we need some guarantees, and not from you because you`re not the one who`s involved in "action" 
Also, why do you say it is legal? Which place on Earth allow killing contracts? Somalia?