Here's what's airing on the ION Networks on April Fools Day, all times Eastern-

ION:

6am-Bones: "The End in the Beginning" (S4E26, OAD: May 14, 2009)
7am-Bones: "Harbingers in a Fountain" (S5E1, OAD: September 17, 2009)
8am-Bones: "The Bond in the Boot" (S5E2, OAD: September 24, 2009)
9am-Bones: "The Plain in the Prodigy" (S5E3, OAD: October 1, 2009)
10am-Bones: "The Beautiful Day in the Neighborhood" (S5E4, OAD: October 8, 2009)
11am-Law & Order: Special Victims Unit: "Exchange" (S20E21, OAD: April 25, 2019)
12pm-Law & Order: Special Victims Unit: "Diss" (S20E22, OAD: May 2, 2019)
1pm-Law & Order: Special Victims Unit: "Assumptions" (S20E23, OAD: May 9, 2019)
2pm-Law & Order: Special Victims Unit: "End Game" (S20E24, OAD: May 16, 2019)
3pm-Law & Order: Special Victims Unit: "I'm Going to Make You a Star" (S21E1, OAD: September 26, 2019)
4pm-Law & Order: Special Victims Unit: "The Darkest Journey Home" (S21E2, OAD: October 3, 2019)
5pm-Law & Order: Special Victims Unit: "Down Low in Hell's Kitchen" (S21E3, OAD: October 10, 2019)
6pm-Law & Order: Special Victims Unit: "The Burden of Our Choices" (S21E4, OAD: October 17, 2019)
7pm-Law & Order: Special Victims Unit: "At Midnight in Manhattan" (S21E5, OAD: October 24, 2019)
8pm-Law & Order: Special Victims Unit: "Murdered at a Bad Address" (S21E6, OAD: October 31, 2019)
9pm-Law & Order: Special Victims Unit: "Counselor, It's Chinatown" (S21E7, OAD: November 7, 2019)
10pm-Law & Order: Special Victims Unit: "We Dream of Machine Elves" (S21E8, OAD: November 14, 2019)
11pm-Law & Order: Special Victims Unit: "Can't Be Held Accountable" (S21E9, OAD: November 21, 2019)
12am-Law & Order: Special Victims Unit: "Must Be Held Accountable" (S21E10, OAD: January 9, 2020)
1am-Law & Order: Special Victims Unit: "She Paints for Vengeance" (S21E11, OAD: January 16, 2020)
2am-Law & Order: Special Victims Unit: "The Longest Night of Rain" (S21E12, OAD: January 30, 2020)

ION Plus:

6am-The Listener: "False I.D." (S4E12, OAD: August 21, 2013)
7am-The Listener: "Fatal Vision" (S4E13, OAD: August 28, 2013)
8am-The Listener: "The Wrong Man" (S5E1, OAD: May 26, 2014)
9am-The Listener: "The Lockup" (S5E2, OAD: June 2, 2014)
10am-The Listener: "Dancing With The Enemy" (S5E3, OAD: June 9, 2014)
11am-The Listener: "Smoke and Mirrors" (S5E4, OAD: June 16, 2014)
12pm-The Listener: "Game Over" (S5E5, OAD: June 23, 2014)
1pm-MacGyver: "UFO + Area 51" (S2E22, OAD: April 27, 2018)
2pm-MacGyver: "MacGyver + MacGyver" (S2E23, OAD: May 4, 2018)
3pm-MacGyver: "Improvise" (S3E1, OAD: September 28, 2018)
4pm-MacGyver: "Bravo Lead + Loyalty + Friendship" (S3E2, OAD: October 5, 2018)
5pm-MacGyver: "Bozer + Booze + Back to School" (S3E3, OAD: October 12, 2018)
6pm-MacGyver: "Guts + Fuel + Hope" (S3E4, OAD: October 19, 2018)
7pm-MacGyver: "Dia de Muertos + Sicarios + Family" (S3E5, OAD: October 26, 2018)
8pm-MacGyver: "Murdoc + MacGyver + Murdoc" (S3E6, OAD: November 2, 2018)
9pm-MacGyver: "Scavengers + Hard Drive + Dragonfly (S3E7, OAD: November 9, 2018)
10pm-MacGyver: "Revenge + Catacombs + Le Fantome" (S3E8, OAD: November 16, 2018)
11pm-MacGyver: "Specimen 234 + PAPR + Outbreak" (S3E9, OAD: November 30, 2018)
12am-MacGyver: "Matty + Ethan + Fidelity" (S3E10, OAD: December 7, 2018)
1am-MacGyver: "Mac + Fallout + Jack" (S3E11, OAD: January 4, 2019)
2am-Midsomer Murders: "Strangler's Wood" (S2E2, OAD: February 3, 1999)
4am-Midsomer Murders: "Dead Man's Eleven" (S2E3, OAD: September 12, 1999)

ION Mystery:

6am-MacGyver: "Murdoc + MacGyver + Murdoc" (S3E6, OAD: November 2, 2018)
7am-MacGyver: "Scavengers + Hard Drive + Dragonfly (S3E7, OAD: November 9, 2018)
8am-MacGyver: "Revenge + Catacombs + Le Fantome" (S3E8, OAD: November 16, 2018)
9am-MacGyver: "Specimen 234 + PAPR + Outbreak" (S3E9, OAD: November 30, 2018)
10am-Criminal Minds: "25 to Life" (S6E11, OAD: December 15, 2010)
11am-Criminal Minds: "Corazon" (S6E12, OAD: January 19, 2011)
12pm-Criminal Minds: "The Thirteenth Step" (S6E13, OAD: January 26, 2011)
1pm-Criminal Minds: "Sense Memory" (S6E14, OAD: February 9, 2011)
2pm-Criminal Minds: "Today I Do" (S6E15, OAD: February 16, 2011)
3pm-Criminal Minds: "Coda" (S6E16, OAD: February 23, 2011)
4pm-Criminal Minds: "Valhalla" (S6E17, OAD: March 2, 2011)
5pm-Criminal Minds: "Lauren" (S6E18, OAD: March 16, 2011)
6pm-Criminal Minds: "With Friends Like These..." (S6E19, OAD: March 30, 2011)
7pm-Criminal Minds: "Hanley Waters" (S6E20, OAD: April 6, 2011)
8pm-Criminal Minds: "The Stranger" (S6E21, OAD: April 13, 2011)
9pm-Criminal Minds: "Out of the Light" (S6E22, OAD: May 4, 2011)
10pm-Criminal Minds: "Big Sea" (S6E23, OAD: May 11, 2011)
11pm-Criminal Minds: "Supply and Demand" (S6E24, OAD: May 18, 2011)
12am-Criminal Minds: "It Takes a Village" (S7E1, OAD: September 21, 2011)
1am-Criminal Minds: "Proof" (S7E2, OAD: September 28, 2011)
2am-CSI: Miami: "Out of Time" (S8E1, OAD: September 21, 2009)
3am-CSI: Miami: "Hostile Takeover" (S8E2, OAD: September 28, 2009)
4am-CSI: Miami: "Bolt Action" (S8E3, OAD: October 5, 2009)
5am-CSI: Miami: "In Plane Sight" (S8E4, OAD: October 12, 2009)