Tossefta sur Les Nombres 15:23

One who is suspected to take a wage (i.e., a bribe) and judge, or to take a wage and testify: All the judgments that he has rendered, and all the testimonies that he has given, behold, all of them are nullified. But one may give a judge a wage (i.e., pay him a salary) to act as a judge, or a witness a wage in order to testify, even though they said, it is kosher for a judge to take a wage and for a witness to take a wage for his testimony. One who is suspected to take payment in order to sprinkle or mix the waters [of purification], his waters are [treated as] cave water, and his ashes are [treated as] burnt ashes. And if he was a priest, he becomes defiled from from [eating] his terumah, and they feed him and give him drink, and anoint him (see Bekh. 4:6). And if he was an Elder, they give him a donkey to ride on, and give him his wage, like an unemployed laborer, even though they said, "ugly is the judge [who takes a salary to judge]." One who is suspected concerning first-borns, one may not even buy from him deerskins or untanned skins. Rabbi Eliezer says, they my buy from him skins from a female, because it has never fallen under the general rule of "consecrated [animals]." Rabbi Shimon says, one who is suspected to sell terumah as chullin, one may not purchase from him anything that has any connection to terumah or tithes, and he is [also] suspected as to all the purities and impurities in the Torah. One who is suspected to be contaminated with corpse-impurity is believed regarding [the location of] marked graves. One who is suspected about seventh-year produce is suspected about tithes, [and] one who is suspected about tithes is suspected about seventh-year produce. One who is suspected about either this or that is suspected about tahorot (i.e., preparation of foods in a state of purity). An Israelite is suspected about tahorot but is not suspected about either tithes or about seventh-year produce. One who is suspected about idolatry is suspected about every commandment that is in the Torah, but not retroactively; rather, from that point forward, as it is said (Num. 15:23), "From the day that God commanded you and forward, through all of your generations."