How do you legally catch a street drug dealer if Terry/Plain feel usually work against the police?

So the question remains, what's the easiest way to get probable cause on a street drug dealer, where the confiscation of the drugs will stick? If a police officers witnesses a deal, do they automatically have probable cause or just reasonable suspicion since a simple glimpse, could not reveal what was... show more So the question remains, what's the easiest way to get probable cause on a street drug dealer, where the confiscation of the drugs will stick?

If a police officers witnesses a deal, do they automatically have probable cause or just reasonable suspicion since a simple glimpse, could not reveal what was actually sold/exhanged for money?

It seems as though Terry and the Plain feel doctrine, they're extremely in favor of the suspect and unless the hidden drugs could resemble a weapon.

So how do you get probable cause on these dealers, so you can quickly take them down, have the all evidence admissible, assuming they don't want to use an informant?
Update: Is an informant or police direct eye witness testimony the only way to get probable cause? Moreover, does direct police testimony of a drug transaction automatically give probable cause, or just reasonable suspicion to further investigate? Suppose the officer has reasonable suspicion after a sale, are they still... show more Is an informant or police direct eye witness testimony the only way to get probable cause? Moreover, does direct police testimony of a drug transaction automatically give probable cause, or just reasonable suspicion to further investigate?

Suppose the officer has reasonable suspicion after a sale, are they still limited to the Terry Stop rules (quick outer layer non invasive search) or does Terry not apply if they directly view a sale?
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