ABS solid & cells core or PVC DWV drainage pipes can handle quite a bit of pressure (pressure rating pending type & wall thickness), however they are also are pressure test to only 4.3psi as stated above.There is no way any (sober) conscious person is going to let you insert that into their rectum let alone with a hose connected to a high pressure supply!
Blowing a joint on a sanitary line is no joking matter. The end result is quite craptacular. D: If his house isn't that old chances are he has plastic which should be able to take the pressure.
I'm not saying you shouldn't try pressure to dislodge clogs, but more on the line of proceed with caution.
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