Body Points (BP) are Modus Operandi's equivalent of Hit Points (HP). It is raised by leveling up.
The formula for the body points is a partial function. Let L = Level.
BP = 40 + (L * 2), L < 25
BP = 90 + (L - 25), L >= 25.
Alternatively the second equation can be written as,
BP = 65 + L, L >= 25,
but original notation shows that at level 25, a character or perp has 90 BP.