The snake made its second public appearance this afternoon and was quickly captured by my in-laws. After closer inspection we know it to be a highly-venomous Brown-Spotted Pit Viper 龜殼花 ! (Pardon me for not removing it from the jar for a clearer picture):
You can read more about this fearless snake here and here.
In trying to learn exactly how poisonous this "highly venomous" snake is, this abstract says it along with another snake "accounts for the majority of venomous snakebites in Taiwan." It is also "associated with a greater risk of severe clinical events, and monitoring for major clinical complications would be recommended."
Actually, this face shot almost makes it look cute!