Some signs that a house might be the site of an indoor marijuana farm:

• The windows are often covered and the blinds drawn. There may be excessive condensation around the windows.

• Electrical outlets may be rigged to divert power from neighboring homes.

• The houses are largely unoccupied. People stop by periodically to mow the lawn or do other chores, then leave.

• There are guard dogs, “Keep Out” signs or other security.

• In winter, after a snowfall, the house may be the lone home on the block with no snow on the roof. (Heat from the lights often melts the snow.)