PHOENIX -- Arizona Cardinals Pro Bowl wide receiver David Boston will not face felony drug possession charges, police said.

The decision follows an incident in March in which a motorist spotted Boston allegedly driving under the influence.

Phoenix police presented the Maricopa County Attorney a report that said two bags of cocaine were found in the back of a police cruiser after Boston was transported.

The Maricopa County Attorney's Office is declining prosecution, saying there isn't sufficient evidence to prosecute on the cocaine charge.

Police are recommending Boston be prosecuted for driving under the influence of drugs.

Blood tests taken after Boston was detained last month for "performing very poorly" during a field sobriety test revealed the presence of cocaine and marijuana.