"that implies they know they are guilty other wise they would not need to plead the 5th"
Doesn't imply anything of the sort.
"When an individual takes the Fifth, her silence or refusal to answer questions cannot be used against her in a criminal case. A prosecutor cannot argue to the jury that the defendant’s silence implies guilt. And prosecutors typically cannot even call a witness before the grand jury if the prosecutor knows the witness will invoke the Fifth Amendment."
