  High-pressure synthesis techniques have allowed for the growth of
Sn$_{1-x}$In$_x$Te samples beyond the ambient In-saturation limit of $x$ = 0.5
(T$_c \sim$ 4.5 K). In this study, we present measurements of the temperature
dependence of the London penetration depth $\Delta\lambda(T)$ in this
superconducting doped topological insulator for $x$ = 0.7, where
T$_{c,onset}\approx 5$ K. The results indicate fully gapped BCS-like behavior,
ruling out odd-parity $A_{2u}$ pairing; however, odd-parity $A_{1u}$ pairing is
still possible. Critical field values measured below 1 K and other
superconducting parameters are also presented.
