yes u can, its tedious work and monitored by the Market Surveillance Division of Bursa.. persistent offenders ... oh and btw its at Bursa discretion to go after offender (i know this for a fact, normally they go after small investors but FF they close an eye)

at end day there will be a print out of al trades done for each particular broker, normally there willl be a team assigned to each broker... there r systems in place to flag suspicious transaction.

it depends on the strategy of the person, normally big volume traders and deep pocketed traders will get caught and of course a trending habit to do such act.

For Example...

E1 is the trader code

Preopening

10am 500 lots IOI at 2.5 Buy
10.20am 500 lots at 2.2 Buy
than etc...

sell sell sell sell be4 market open