Both sides must avail themselves of circumstantial, rather than direct evidence.
From the theatlantic.com
Angela then made follow-up calls on April 6, 12, 17, 24 and 30, all to no avail.
From the newsobserver.com
All my attempts to get this ridiculous situation resolved have been to no avail.
From the guardian.co.uk
Emergency personnel attempted resuscitation and chest compressions, to no avail.
From the cnn.com
I have searched the Internet to no avail, and no one I have asked seems to know.
From the dailynews.com
Deputies tried to resuscitate Wagner using CPR and a defibrillator, to no avail.
From the denverpost.com
Lately it's been getting worse and I have tried to put a stop to it to no avail.
From the blogs.psychcentral.com
Passengers at other airports can avail of similar facilities at partner lounges.
From the en.wikipedia.org
Several men were organised to fight the fire from the quayside, but to no avail.
From the en.wikipedia.org
More examples
A means of serving; "of no avail"; "there's no help for it"
Use to one's advantage; "He availed himself of the available resources"
Be of use to, be useful to; "It will avail them to dispose of their booty"
Take or use; "She helped herself to some of the office supplies"
AVAIL is Avail's first release ever. It was originally released on vinyl only in 1989. A remix of this album, containing re-recordings of four songs, was released in 1991. The recording of this album took place in December 1989 at Inner Ear Studios.
Avail is a punk band from Richmond, Virginia. Originally from Northern Virginia, the band formed in 1987, its members including Joe Banks, Doug Crosby, Brian Stewart and Mikey Warstler. ...
Benefit; value, profit; advantage toward success. [15th-19th c.]; Effect in achieving a goal or aim; purpose, use (now usually in negative constructions). [from 15th c.]; Proceeds; profits from business transactions. [from 15th c. ...
(availing) Effect in achieving a goal or aim; purpose, use; Efficacious
(Avails) Time on a station or network, which is available for sale.