Halacha:

Tzitzis 

References: Shulchan Aruch: או"ח ח/ט ,  Shulchan Aruch: או"ח תל"ז ,  Shulchan Aruch: יו"ד א ,  Shulchan Aruch: יו"ד ר"א/ס"ה ,  Shulchan Aruch: או"ח ל"ט/י  

Description

Must we check the facts before we do a Mitzvah or can we rely on the fact that the Tallit is usually kosher, the chicken was slaughtered by a professional Shochet and the Mikvah waters remain stationary?