I would like to know where (in the Talmud) to find any information on how to proceed when there is a case of doubt wether or not a blessing should be said.
Shelam
abashuta, Portland, OR USA
See Gilyon ha'Shas in the margin to Berachos 12a.
It says on Shabbos 34a that a doubt regarding a rabbinical law is treated leniently. Therefore, since most blessings are rabbinically instituted, when there is a doubt, one may be lenient. There is discussion whether this applies to blessings said before eating food, as it is prohibited to eat without a blessing.
Y. Shaw