Many cities have a laboratory where individuals can take their clothes to check if there is shatnez and if necessary to remove it.

Often these laboratories are under the supervision of the local Beis Din or Kashrus Authority.

Most activities to which Botei Din give approval are regularly inspected (e.g. butcher's shops).

According to Halacho, how frequently should these laboratories be checked for their ability to detect shatnez?

  • Exactly how do you expect to check them. No rabbi knows the difference between wool and linen. Only through asking another certified checker to double check clothing that has already been checked. They will always have an excuse how something got "through". You could ask the same with sofrus or shechita. No sofer is ever checked either. Although his mistakes are easier to find. I dont think you will find halachos about this.
    – newcomer
    May 15, 2016 at 14:46
  • many people do have their works that have been written by a Sofer checked over by someone else.
    – RG1
    May 15, 2016 at 15:22
  • From what I understand most of most of the Bais Dins and kashrush authorities do check the shatnez laboratories ever (they do not know how to) the only thing they can check is if the checker is acting as an yira shomaim
    – hazoriz
    May 15, 2016 at 18:54
  • Even it is computer checked like today, it still doesnt prove that the sofer wrote it with the correct "kavono". The same with shechito there is no way of checking a shochet who says a torn "sircha" is kosher. He could always tear it himself.
    – newcomer
    May 15, 2016 at 18:56
  • @hazoriz So all we can say is that the shatnez checker is a yorei shomayim who may or may not know the relevant dinim. Seems then to me that I should find out for myself whether the Beis Din has checked the ability of the checker to check. May 15, 2016 at 20:08


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