Dirt (as in topsoil)? For sure.
Glacial till (rough sand, fairly big rocks)? Much more difficult.
Solid granite? Very unlikely, simply pushing down on it.
There are certainly ways to tackle getting a 1/2" rod or blade 8' into the ground, but a simple press won't do it.
If the Government had a truck capable of rolling up in your drive.. and ramming a blade into your sewer line. severing it..
They could analize the contents and therefore not bust down your front door with a battering ram, bust your toilet with a sledgehammer and hold your family hostage.. At gunpoint, I might add.
Then, they could come knock on the door like civilized folk.
And if they made a mistake.. ? HEY! I suppose it would be up to your city to foot the bill... (Read very visible Tax Dollars) Now, wouldnt it?