I am curious at how you think your going to get a hair folicle test ordered? Ive NEVER seen it done. Also, if his hair is short, like 1 inch, it likely would show nothing, as it's new clean hair.
Remember too, substances break down differently and show as common things in final stages. Ive sat in court and seen someone who hasnt used in 2 weeks show up positive with traces in urine tests, then Ive seen my Ah show up clean 3 days after use.
Hair folicles are the same it depends on the individual, new hair ect and how much detoxifying their body they do
Againwith this what does your lawyer think?