  We investigate the relative assembly map from the family of finite subgroups
to the family of virtually cyclic subgroups for the algebraic $K$-theory of
twisted group rings of a group G with coefficients in a regular ring R or, more
generally, with coefficients in a regular additive category. They are known to
be isomorphisms rationally. We show that it suffices to invert only those
primes p for which G contains a non-trivial finite p-group and p is not
invertible in R. The key ingredient is the detection of Nil-terms of a twisted
group ring of a finite group F after localizing at p in terms of the
p-subgroups of F using Verschiebungs and Frobenius operators. We construct and
exploit the structure of a module over the ring of big Witt vectors on the
Nil-terms. We analyze the algebraic K-theory of the Hecke algebras of subgroups
of reductive p-adic groups in prime characteristic.
