Common and Uncommon Shaatnez Spots on One Garment

35. Sometimes, within one garment there are sections that commonly have shaatnez and sections that have a rate of occurrence of shaatnez low enough to not require checking. Many shaatnez labs, especially in Chutz Lo’oretz, only check the sections that have a rate that obligates checking and do not check the other sections.

36. However, some hold once a checker receives a garment to check the parts that commonly have shaatnez, he must also check the parts that do not. This is because we do not rely on majority when the reality can be determined, unless doing so would be very burdensome. Sections of the garment that almost never have shaatnez do not need to be checked (שו"ת שבט הלוי ח"י סי' קפ"ה, הגריש"א, ספר השעטנז להלכה פ"ז הע' ח"י ).