>I'm not sure what a "squelch circuit" is, but since the
>ransom note said John was being monitored, is it possible
>the perp(s) monitored the 911 call to police?
The call was monitored by the 'Two Gentlemen' in the 'Small Foreign Faction'.

I see no reason to monitor or intercept 911 calls or to time police response. The perpetrator would gain nothing and lost alot.
Once a cop car rolls up, they've called. What would a few minutes earlier notification gain the perpetrator?