Last Sunday while ushering at Our Lady’s shrine in DC, a young lady went up to communion, walked away with the host and instead of eating it, looked at it curiously and went back to her pew.
I approached her and told her she had to eat it right away. She refused so I told her she had to give it back. Thankfully she gave it back without further incidence. Who knows what she was planning to do with it, but odds are she is not Catholic. She gave me a glare afterwards, but I just ignored her and went about my business.
I wanted to give her a piece of my mind later but just let it go. I think she was embarassed enough after having been confronted. I suppose there should be some notices about non-Catholics not receiving Communion and especially not taking the host away.