Drones - anyone seen any flying around their area yet ?

Heard something fly over my area earlier this year and sounded somewhat like small push mower engine and it was nighttime and normally wouldnt have thought twice about it but the sound was so different it caught my attention.I told a relative about it and he said they were supposedly testing some about an hour away from me but dont know how accurate that is.Please forgive my typing.Have heard most will be to high up to even see.