There is a range of opinions on the issue of how often a yotzi v’nichnas needs to enter to establish mirsas and if customers at establishments where they are relying on the more makil side inquire they may be able to find out. For instance I found that the difference between o-u and o-u P on a particular canned product was a mashgiach visiting once a month for o-u and a constant presence for 6-8 weeks before Pesach, now which one do you think is less likely to have a mishap?
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