A number of manufacturers are yet to comply with the ban on plastics for secondary packaging, commonly known as cellophane film.This is more than a year after the ban on plastic bags came into effect, posing unfair competition in the market.The National Environment Management Authority imposed the ban on use, manufacture and importation of plastic bags in March last year, with full implementation taking effect on August 28.According to Nema, those found violating the law risk up to four years imprisonment or fine of up to Sh4 million or both.