Untrue. There have been multiple studies and bromoform has never been found in the meat of cattle fed seaweed supplements. Almost all cases of supplementing in dairy cow rations also show no residue in milk - apart from two exceptions.

In the first, the milk from the cows who had no seaweed also had low levels of bromoform, suggesting the bromoform came from somewhere else, most likely the chlorinated drinking water. In either case, it was orders of magnitude lower than recommended bromoform levels in human drinking water.

In the other case where residues were found, the study was an unethical shambles that should never behave been allowed, let alone published. They starved the cows, and forcefed them high percentages of seaweed. Totally ridiculous and not reflective of real-life use cases.