Evidence tampering charges against a man and his brother were dismissed for lack of evidence last week after the court found prosecutors couldn’t prove a conspiracy to remove marijuana from the house.The brothers, Corey R. Hill and Marvin R. Hill Jr., both had charges of evidence tampering dismissed following a preliminary hearing. Corey Hill, however, still faces serious charges including aggravated domestic assault and possession of marijuana for resale. Those counts were bound to the grand jury.Marvin Hill had been accused of entering Corey’s residence after receiving a call from his brother.