To a point (if you mean Code protection). If a Quaesitor is scrying as part of a legitimate Hermetic investigation, they're fairly safe - though you probably want to uncover something beforehand to justify a more in-depth investigation.
The only Order that has search warrants is the Raudskinna Compact - the Order of Hermes' Quaesitores just have to justify their actions post facto.
I remembered it incorrectly as scrying, when it's Intellego Mentem magics which are forbidden for use against magi and their servants (HoH:TL, page 62). However, scrying upon one magus might well lead to scrying upon an innocent magus...
Remember, that sanctity of secrets is one of the most, if not the most, important clauses of the Order, and probably the only reason half the houses agreed to join. If the Quaesitor managed to get the right to scry on you, then you've probably already fucked up something fierce and are a suspected infernalist, or worse, a sahir. These are middle ages, patents haven't been invented yet. If you don't ruthlessly crush everyone who even looks in the direction of your lab, you are going to die alone and with all your research published by the young enterprising tremere.
It's an important clause, but Quaesitores have a qualified immunity against it (HoH:TL 62). So long as they don't blab about any secrets they find or actually mind probe you, they are pretty much in the clear.
(Also, there are plenty of sahirs quite openly in the Order.)