  We analyze potential violations of causality in Unruh DeWitt-type detector
models in relativistic quantum information. We proceed by first studying the
relation between faster-than-light signaling and the causal factorization of
the dynamics for multiple detector-field interactions. We show in what way
spatially extended non-relativistic detector models predict superluminal
propagation of the field's initial conditions. We draw parallels between this
characteristic of detector models, stemming from their non-relativistic
dynamics, and Sorkin's "impossible measurements on quantum fields"
arXiv:gr-qc/9302018. Based on these features, we discuss the validity of
measurements in QFT when performed with non-relativistic particle detectors.
