the human mind cannot process a negative. for example; try to not imagine a pink elephant.........first the mind visualises a pink elephant then deletes it. the child learns by this method. everything you say and do gets processed in a positive way. then the editing and deletion begins.
the master lawyer will contaminate a jury by making stements in open court that he knows will be struck from the record and the jury instructed to ignore......but the information is already installed.
you would thing ethics professors would know this already.