Kosher Status of McDonald's

Hello and blessings

One who relies on the kashrut of a regular rabbinical authority, which is not strict, and eats at a McDonald's that has a kashrut certificate from the rabbinical authority, has not transgressed his boundaries.

I will copy for you what I have written in the past about the different types of kashrut supervision in Israel, and you will understand why it is not advisable to rely on a regular kashrut of a rabbinical authority [that is not strict].

More or less, the level of kashrut can be divided into four groups.

Standard local rabbinical supervision. This is a service provided according to the regulations of Israeli law, and it is the most basic level. Haredim, Dati-Leumi, and some religious individuals will not eat from this kashrut.
 
“Mehadrin” local rabbinical supervision.  Exists only in some local rabbinical authorities such as Jerusalem, Tel Aviv, and others. This kashrut claims to be stringent but does not always succeed. The main reason is that since they are connected to the religious council, they are controlled by politicians, some of whom are secular, who determine matters pertaining to kashrut policy, and they have complete control over all aspects of employment of inspectors, who, unfortunately, are often not suitable to be kashrut supervisors.
 
Badatz (Beth Din Zedek) organizations. Kashrut organizations belonging to various Haredi courts, such as the Edah Haredith, Belz, Rabbi Landa – Av Beit Din of Bnei Brak, Rabbi Rubin, Badatz Beit Yosef, Rabbi Machpud, and others. These Badatz organizations maintain a high level of kashrut, inspect every product, send inspectors frequently, and do not leave kashrut to chance. These Badatz organizations are recognized by the Chief Rabbinate.
 
Fictitious Badatz organizations and mere charlatans. Unfortunately, there are fictitious organizations in the market that claim to be Badatz although they have no connection to kashrut. Usually, they are people with a Haredi appearance, dressed in the best traditional rabbinical attire, with slick tongues, offering ultra-stringent kashrut at minimal cost. Initially, they provide kashrut instructions as if they truly plan to establish good kashrut. The only connection they have with the supervised establishment is a permanent instruction that continues to operate. These organizations are not recognized by the Chief Rabbinate.

Regarding McDonald's, an additional point is that it is advisable for a person to set a boundary for themselves, that they do not enter a chain that also operates non-kosher branches, because once one gets used to a kosher branch, it is possible to mistakenly enter a branch that is not kosher, and only then realize the mistake, and by then it is already too late.

Good luck - Menashe Yisrael