No they don't. Pre-launch satellites do not normally leak toxic chemicals, nor emit noteworthy radiation, nor have dangerous voltages on exposed surfaces, nor ...
And as a Plan B - any satellites filled with secret sauce could easily be babysat (while in SpaceX's hands) by trusty USSF TSgt Top-Secret, who's been trained in what to do if things go horribly wrong.
Sats are sats. They all have thrusters, antennas and solar panels. They have a center of mass, various g limits and have to fit inside the rocket. Everything else can be hidden from the launch provider.
