The FCC would not let that happen. Per FCC the radio operations SHALL not be changed with out FCC approval I think this old e-mail post explains why this can not happen. This is just one area of FCC control as stated below YOU THE USER SHALL NOT MODIFY THE OPERATION OF THE SCANNER.
From: Paul Opitz [SMTPopitz1@Tandy.com]
Sent: Saturday, December 13, 1997 8:25 AM
To: 'bch...@san.rr.com'
Subject: SCANNER POLICY MEMO
> Early in 1997, representatives from industry, including RadioShack,
> met informally with the FCC to discuss current problems in the
> scanning hobby. Identified as a major problem was the ability of some
> scanner hobbyists to develop illegal modifications that allow scanners
> to receive cellular telephone transmissions. Among the possibilities
> discussed for eliminating this problem were the total epoxying of all
> circuit boards, which would render scanners both unmodifiable and
> unserviceable, or the restriction of technical information regarding
> scanner circuit design.
>
> As a result of this meeting, Tandy limited the availability of scanner
> service manuals to Tandy Service Centers only.
>
> While Tandy understands the desire of the do-it-yourself community to
> have easy access to service information, we feel the interests of the
> scanning hobby as a whole are best served by making it more difficult
> to develop illegal modifications by restricting access to some service
> manuals containing schematics. Therefore, in response to industry
> concerns, Tandy is implementing the following policy in regards to the
> release of service information and the servicing of scanners.
>
> * Tandy (RadioShack and TechAmerica) will withhold schematics
> (service manuals) for all scanners that can receive 800 MHz or above
> which were submitted for FCC certification after April, 1997. As of
> December 12, 1997, this means that service manuals for the following
> RadioShack scanners will not be available: 20-417 (PRO-2048), 20-430
> (PRO-2050), 20-512 (PRO-67), and 20-520 (PRO-90), along with all
> future service manuals within the stated criteria.
>
> * To the extent that service manuals exist and are in stock,
> schematics (service manuals) for scanners that can receive 800 MHz or
> above that were submitted for FCC certification before May, 1997 will
> continue to be available to customers and others.
>
> * To the extent that service manuals exist and are in stock,
> schematics (service manuals) for scanners that cannot receive 800 MHz
> or above will continue to be available to customers and others.
>
> * Modified scanners (regardless of frequency or date of
> manufacture) will not be serviced by Tandy. These scanners will be
> returned to the customer with a notice indicating that the unit
> appears to have been modified and if the scanner is returned to its
> original specifications, Tandy will use reasonable efforts to repair
> it.
>
> * To the extent that scanner parts are available and in stock,
> scanner replacement parts will continue to be available regardless of
> the scanner's frequency range or date of manufacture.