Trade school tuition is eligible for a tuition credit or adjustment to income (above the line deduction). But it most still be an eligible institution. The half time requirement is only for the most generous credit. A single course is eligible for the lesser tax breaks.
To be eligible for the tuition credits or tuition & fees deduction, the course must be taken at "an eligible institution". The school should be able to tell you if it is an eligible educational institution. In general, an eligible educational institution is an accredited college, university, vocational school, or other postsecondary educational institution, including accredited, public, nonprofit, and proprietary (privately-owned, profit-making) postsecondary institutions. Additionally, in order to be an eligible educational institution, the school must be eligible to participate in a student aid program administered by the Department of Education. If they issue a 1098-T they are probably an eligible institution.
Enter your school at the link below, to see if it's on the dept. of education list.
https://fafsa.ed.gov/FAFSA/app/schoolSearch?locale=en_EN
