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Since the mid-1980s the shock-in-jet model has been the preferred paradigm toexplain radio-band flaring in blazar jets. We describe our radiative transfermodel incorporating relativistically-propagating shocks, and illustrate how the4.8, 8, and 14.5 GHz linear polarization and total flux density data from theUniversity of Michigan monitoring program, in combination with the model,constrain jet flow conditions and shock attributes. Results from strongFermi-era flares in 4 blazars with widely-ranging properties are presented.Additionally, to investigate jet evolution on decadal time scales we analyze 3outbursts in OT 081 spanning nearly 3 decades and find intrinsic changesattributable to flow changes at a common spatial location, or, alternatively,to a change in the jet segment viewed. The model's success in reproducing thesedata supports a scenario in which relativistic shocks compress a plasma with anembedded passive, initially-turbulent magnetic field, with additional orderedmagnetic field components, one of which may be helical.

Radiative Transfer Modeling of Radio-band Linear Polarization  Observations as a Probe of the Physical Conditions in the Jets of Gamma-ray  Flaring Blazars