They were arrested 2 weeks ago near Cullompton
A man and a woman, who reportedly had sex on a National Express service as it travelled along the M5 will face no further action.
A 29 year old man from Bristol and a 32 year old woman from Barnstaple, were arrested on suspicion of an act of outraging public decency.
Now Devon and Cornwall Police say CCTV from the bus was "inconclusive".
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