This is my first post here, I usually just lurk.
Sending unwashed clothes with human fluid on it through the mail is considered illegal. Because the human fluid is considered hazardous material due to any unknown disease that it may have.
A girl did get arrested for selling stained items through the mail just over a year ago. She was a college student & a disgruntled customer sent something to her marked 'child porn' to draw the suspicion of the feds. And when they investigated her for that they discovered the use clothing & she was arrested for transporting hazard materials through the mail.