In the previous column, I explained the difference between standard and mehadrin kashrut, namely, that standard kashrut goes according to the rules of halakha, whereas mehadrin kashrut takes into consideration the strict opinions, beyond what is required by halakha.
Incidentally, if there are any readers who know differently, and indeed, there is a halakhic issue in which the standard hechsher (a rabbinical product certification, qualifying items that conform to the requirements of halakha) follows a method that does not conform to the rules of halakha, please inform me.
To be more precise:
There is no hechsher, even the highest quality mehadrin, which meets the requirements of all strict opinions, in a case where the hidur (embellishment) involves extremely high costs, the mehadrin are usually also lenient.
In other words,
the difference between standard kashrut and mehadrin is not absolute, for even standard kashrut when it is not difficult, take into consideration the more stringent opinions, even if it involves a disagreement in Divrei Chachamim (rabbinical ordinance), and most poskim permit.
There is no hechsher, even the highest quality mehadrin, which meets the requirements of all strict opinions, in a case where the hidur (embellishment) involves extremely high costs, the mehadrin are usually also lenient.
In other words,
the difference between standard kashrut and mehadrin is not absolute, for even standard kashrut when it is not difficult, take into consideration the more stringent opinions, even if it involves a disagreement in Divrei Chachamim (rabbinical ordinance), and most poskim permit.
An example of this is the chumra (stringency) of the Chief Rabbinate in the Land of Israel regarding chalav nochri (milk not produced under Jewish supervision):