Chalav Yisrael

[2] Today, many observant Jews rely on the ruling of Rabbi Moshe Feinstein, who argues that in countries such as the United States, where there is strict regulation against mixing milks, all milk is considered Chalav Yisrael.

Mashgichim are also responsible for ensuring that there is no opportunity for the milk to become non–chalav Yisrael at any point before it leaves the facility.

There is a separate prohibition on cheese manufactured by non-Jews, which has its own parameters (gevinat akum).

The most well-known licence to drink such milk came from the prominent post-war American posek Rabbi Moshe Feinstein.

In his Igros Moshe, Rabbi Feinstein permitted chalav stam in areas where local laws prohibit the mixing of kosher and non-kosher milks.

[14] This has led to the usage of the term chalav Yisrael to refer to milk supervised by Jews which does not rely on Rabbi Feinstein's leniency.