As part of efforts to crack down on visa violators, the Tokyo Metropolitan Government will issue directives to ensure vocational schools in the capital that accept foreign students do not allow their charges to run astray.

The metropolitan government is currently drafting directives for the schools for accepting and supervising foreign students, on the assumption that insufficient supervision is a factor behind foreign students overstaying their visas and engaging in labor illegally.

According to a metropolitan government survey of 14 vocational schools with foreign students in Toshima, Shinjuku and Shibuya wards released last week, eight of the institutions had dropped more than 10 percent of their foreign students from their rosters in fiscal 2003, citing such reasons as they disappeared.