The principle of ed echad ne’eman be issurin (and ne’emanut in general) says that if a Jew is a shomer shabbos, you trust his hashgacha. Smaller hechshers run by shomer shabbat rabbanim require the individual to ascertain whether those standards are acceptable to him, just as many individuals don’t even rely on the “big 5” for all things (e.g. those who believe tuna requires bishul yisrael wouldn’t purchase OU tuna fish, and so on).
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