4 ms·

I find it really interesting that the blade lengths are given in inches ((3 inches or less") rather than 7 or 8 cm.

• Symbiote 11y ago
  That law comes from the Criminal Justice Act 1988: http://www.legislation.gov.uk/ukpga/1988/33/section/139 http://www.legislation.gov.uk/ukpga/1988/33/section/139 Some legislation has been updated with metric measurements (example [1]), but not everything. This one is newer than metrication, but perhaps the length was based on something that existed before, like a police or sentencing guideline. [1] http://www.legislation.gov.uk/ukpga/1979/21/schedule/1 http://www.legislation.gov.uk/ukpga/1979/21/schedule/1