Cordon is in place while chemical is identified. Ambulance staff are treating nine people.
M6 closed in both directions between J3 A444 / B4113 (Nuneaton / Bedworth / Coventry) and J4 M42 / A446 (Coleshill), congestion on M6 to J2 M69 / A46 (Coventry) Northbound.
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The victim, who cannot be named for legal reasons, spoke to a social worker after the alleged attack by a Northamptonshire Police constable.
Seven persistent beggars have been banned from entering Wolverhampton city centre during certain times.